diff --git a/org.mixedrealitytoolkit.core/CHANGELOG.md b/org.mixedrealitytoolkit.core/CHANGELOG.md
index ffe977dc0..9418c6d51 100644
--- a/org.mixedrealitytoolkit.core/CHANGELOG.md
+++ b/org.mixedrealitytoolkit.core/CHANGELOG.md
@@ -2,6 +2,12 @@
 
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/).
 
+## Unreleased
+
+### Deprecated
+
+* Deprecated `EnumFlagsAttribute` in favor of `Unity.XR.CoreUtils.GUI.FlagsPropertyAttribute`. [PR #1075](https://github.com/MixedRealityToolkit/MixedRealityToolkit-Unity/pull/1075)
+
 ## [4.0.0-pre.2] - 2025-12-05
 
 ### Added
@@ -16,12 +22,12 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/).
 
 ### Removed
 
-* Removed ITrackedInteractor, as it was supporting an unused codepath and there are better ways to get this data (like querying the attach transform). [PR #1044](https://github.com/MixedRealityToolkit/MixedRealityToolkit-Unity/pull/1044)
+* Removed `ITrackedInteractor`, as it was supporting an unused codepath and there are better ways to get this data (like querying the attach transform). [PR #1044](https://github.com/MixedRealityToolkit/MixedRealityToolkit-Unity/pull/1044)
 
 ### Deprecated
 
-* Deprecated IHandedInteractor, as its info is now queryable directly from IXRInteractor's handedness property. [PR #1042](https://github.com/MixedRealityToolkit/MixedRealityToolkit-Unity/pull/1042)
-* Deprecated FindObjectUtility, as it was a backwards-compatibility layer for pre-2021.3.18. Since our min version is now 2022.3, we can just call the API directly. [PR #1058](https://github.com/MixedRealityToolkit/MixedRealityToolkit-Unity/pull/1058)
+* Deprecated `IHandedInteractor`, as its info is now queryable directly from IXRInteractor's handedness property. [PR #1042](https://github.com/MixedRealityToolkit/MixedRealityToolkit-Unity/pull/1042)
+* Deprecated `FindObjectUtility`, as it was a backwards-compatibility layer for pre-2021.3.18. Since our min version is now 2022.3, we can just call the API directly. [PR #1058](https://github.com/MixedRealityToolkit/MixedRealityToolkit-Unity/pull/1058)
 
 ## [4.0.0-pre.1] - 2024-07-09
 
diff --git a/org.mixedrealitytoolkit.core/Utilities/Attributes/EnumFlagsAttribute.cs b/org.mixedrealitytoolkit.core/Utilities/Attributes/EnumFlagsAttribute.cs
index 71fdefe15..c2607c8e2 100644
--- a/org.mixedrealitytoolkit.core/Utilities/Attributes/EnumFlagsAttribute.cs
+++ b/org.mixedrealitytoolkit.core/Utilities/Attributes/EnumFlagsAttribute.cs
@@ -14,6 +14,7 @@ namespace MixedReality.Toolkit
     /// From https://answers.unity.com/questions/486694/default-editor-enum-as-flags-.html
     /// </remarks>
     [AttributeUsage(AttributeTargets.Field)]
+    [Obsolete("Use Unity.XR.CoreUtils.GUI.FlagsPropertyAttribute instead.")]
     public sealed class EnumFlagsAttribute : PropertyAttribute
     {
         /// <summary>
@@ -21,4 +22,4 @@ public sealed class EnumFlagsAttribute : PropertyAttribute
         /// </summary>
         public EnumFlagsAttribute() { }
     }
-}
\ No newline at end of file
+}
diff --git a/org.mixedrealitytoolkit.spatialmanipulation/BoundsControl/BoundsControl.cs b/org.mixedrealitytoolkit.spatialmanipulation/BoundsControl/BoundsControl.cs
index a2592ae0a..e968e5259 100644
--- a/org.mixedrealitytoolkit.spatialmanipulation/BoundsControl/BoundsControl.cs
+++ b/org.mixedrealitytoolkit.spatialmanipulation/BoundsControl/BoundsControl.cs
@@ -1,15 +1,12 @@
 // Copyright (c) Mixed Reality Toolkit Contributors
 // Licensed under the BSD 3-Clause
 
+using System;
 using Unity.Profiling;
+using Unity.XR.CoreUtils.GUI;
 using UnityEngine;
 using UnityEngine.XR.Interaction.Toolkit;
 using static MixedReality.Toolkit.SpatialManipulation.ObjectManipulator;
-using System;
-
-#if UNITY_EDITOR
-using UnityEditor;
-#endif
 
 namespace MixedReality.Toolkit.SpatialManipulation
 {
@@ -108,8 +105,7 @@ public bool OverrideBounds
             }
         }
 
-        [SerializeField]
-        [DrawIf("overrideBounds")]
+        [SerializeField, DrawIf("overrideBounds")]
         [Tooltip("The bounds will be calculated from this object and this object only, instead of the entire hierarchy.")]
         private Transform boundsOverride;
 
@@ -199,8 +195,7 @@ public bool ToggleHandlesOnClick
             set => toggleHandlesOnClick = value;
         }
 
-        [SerializeField]
-        [DrawIf("toggleHandlesOnClick")]
+        [SerializeField, DrawIf("toggleHandlesOnClick")]
         [Tooltip("During a selection of the associated interactable, if the interactable is dragged/moved a smaller distance than this value, the handles will be activated/deactivated.")]
         private float dragToggleThreshold = 0.02f;
 
@@ -262,8 +257,7 @@ public HandleType EnabledHandles
             set => enabledHandles = value;
         }
 
-        [EnumFlags]
-        [SerializeField]
+        [SerializeField, FlagsProperty]
         [Tooltip("Specifies whether the rotate handles will rotate the object around its origin, or the center of its calculated bounds.")]
         private RotateAnchorType rotateAnchor = RotateAnchorType.BoundsCenter;
 
@@ -282,8 +276,7 @@ public RotateAnchorType RotateAnchor
             }
         }
 
-        [EnumFlags]
-        [SerializeField]
+        [SerializeField, FlagsProperty]
         [Tooltip("Specifies whether the scale handles will rotate the object around their opposing corner, or the center of its calculated bounds.")]
         private ScaleAnchorType scaleAnchor = ScaleAnchorType.OppositeCorner;
 
@@ -336,8 +329,7 @@ public bool SmoothingActive
             set => smoothingActive = value;
         }
 
-        [SerializeField]
-        [DrawIf("smoothingActive")]
+        [SerializeField, DrawIf("smoothingActive")]
         [Tooltip("Enter amount representing amount of smoothing to apply to the rotation. Smoothing of 0 means no smoothing. Max value means no change to value.")]
         private float rotateLerpTime = 0.00001f;
 
@@ -350,8 +342,7 @@ public float RotateLerpTime
             set => rotateLerpTime = value;
         }
 
-        [SerializeField]
-        [DrawIf("smoothingActive")]
+        [SerializeField, DrawIf("smoothingActive")]
         [Tooltip("Enter amount representing amount of smoothing to apply to the scale. Smoothing of 0 means no smoothing. Max value means no change to value.")]
         private float scaleLerpTime = 0.00001f;
 
@@ -364,8 +355,7 @@ public float ScaleLerpTime
             set => scaleLerpTime = value;
         }
 
-        [SerializeField]
-        [DrawIf("smoothingActive")]
+        [SerializeField, DrawIf("smoothingActive")]
         [Tooltip("Enter amount representing amount of smoothing to apply to the translation. " +
             "Smoothing of 0 means no smoothing. Max value means no change to value.")]
         private float translateLerpTime = 0.00001f;
@@ -395,8 +385,7 @@ public bool EnableConstraints
             set => enableConstraints = value;
         }
 
-        [SerializeField]
-        [DrawIf("enableConstraints")]
+        [SerializeField, DrawIf("enableConstraints")]
         [Tooltip("Constraint manager slot to enable constraints when manipulating the object.")]
         private ConstraintManager constraintsManager;
         /// <summary>
@@ -439,7 +428,7 @@ public LogicType ManipulationLogicTypes
         [Header("Events")]
 
         [SerializeField]
-        SelectEnterEvent manipulationStarted = new SelectEnterEvent();
+        private SelectEnterEvent manipulationStarted = new SelectEnterEvent();
 
         /// <summary>
         /// Fired when manipulation on a handle begins.
@@ -451,7 +440,7 @@ public SelectEnterEvent ManipulationStarted
         }
 
         [SerializeField]
-        SelectExitEvent manipulationEnded = new SelectExitEvent();
+        private SelectExitEvent manipulationEnded = new SelectExitEvent();
 
         /// <summary>
         /// Fired when manipulation on a handle ends.
diff --git a/org.mixedrealitytoolkit.spatialmanipulation/Constraints/MoveAxisConstraint.cs b/org.mixedrealitytoolkit.spatialmanipulation/Constraints/MoveAxisConstraint.cs
index 7694ea4f5..032760021 100644
--- a/org.mixedrealitytoolkit.spatialmanipulation/Constraints/MoveAxisConstraint.cs
+++ b/org.mixedrealitytoolkit.spatialmanipulation/Constraints/MoveAxisConstraint.cs
@@ -1,6 +1,7 @@
 // Copyright (c) Mixed Reality Toolkit Contributors
 // Licensed under the BSD 3-Clause
 
+using Unity.XR.CoreUtils.GUI;
 using UnityEngine;
 
 namespace MixedReality.Toolkit.SpatialManipulation
@@ -18,8 +19,7 @@ public class MoveAxisConstraint : TransformConstraint
     {
         #region Properties
 
-        [SerializeField]
-        [EnumFlags]
+        [SerializeField, FlagsProperty]
         [Tooltip("Constrain movement along an axis")]
         private AxisFlags constraintOnMovement = 0;
 
diff --git a/org.mixedrealitytoolkit.spatialmanipulation/Constraints/RotationAxisConstraint.cs b/org.mixedrealitytoolkit.spatialmanipulation/Constraints/RotationAxisConstraint.cs
index 8ccea8cff..2d07ad2b5 100644
--- a/org.mixedrealitytoolkit.spatialmanipulation/Constraints/RotationAxisConstraint.cs
+++ b/org.mixedrealitytoolkit.spatialmanipulation/Constraints/RotationAxisConstraint.cs
@@ -1,6 +1,7 @@
 // Copyright (c) Mixed Reality Toolkit Contributors
 // Licensed under the BSD 3-Clause
 
+using Unity.XR.CoreUtils.GUI;
 using UnityEngine;
 
 namespace MixedReality.Toolkit.SpatialManipulation
@@ -17,8 +18,7 @@ public class RotationAxisConstraint : TransformConstraint
     {
         #region Properties
 
-        [SerializeField]
-        [EnumFlags]
+        [SerializeField, FlagsProperty]
         [Tooltip("Constrain rotation about an axis")]
         private AxisFlags constraintOnRotation = 0;
 
diff --git a/org.mixedrealitytoolkit.spatialmanipulation/Constraints/TransformConstraint.cs b/org.mixedrealitytoolkit.spatialmanipulation/Constraints/TransformConstraint.cs
index 58012bc1e..d9e13e7a4 100644
--- a/org.mixedrealitytoolkit.spatialmanipulation/Constraints/TransformConstraint.cs
+++ b/org.mixedrealitytoolkit.spatialmanipulation/Constraints/TransformConstraint.cs
@@ -1,7 +1,7 @@
 // Copyright (c) Mixed Reality Toolkit Contributors
 // Licensed under the BSD 3-Clause
 
-using System;
+using Unity.XR.CoreUtils.GUI;
 using UnityEngine;
 
 namespace MixedReality.Toolkit.SpatialManipulation
@@ -17,8 +17,7 @@ public abstract class TransformConstraint : MonoBehaviour
     {
         #region Properties
 
-        [SerializeField]
-        [EnumFlags]
+        [SerializeField, FlagsProperty]
         [Tooltip("What type of manipulation this constraint applies to. Defaults to One Handed and Two Handed.")]
         private ManipulationHandFlags handType = ManipulationHandFlags.OneHanded | ManipulationHandFlags.TwoHanded;
 
@@ -31,8 +30,7 @@ public ManipulationHandFlags HandType
             set => handType = value;
         }
 
-        [SerializeField]
-        [EnumFlags]
+        [SerializeField, FlagsProperty]
         [Tooltip("What type of manipulation this constraint applies to. Defaults to Near and Far.")]
         private ManipulationProximityFlags proximityType = ManipulationProximityFlags.Near | ManipulationProximityFlags.Far;
 
diff --git a/org.mixedrealitytoolkit.spatialmanipulation/ObjectManipulator/ObjectManipulator.cs b/org.mixedrealitytoolkit.spatialmanipulation/ObjectManipulator/ObjectManipulator.cs
index a89a8406e..8f70d1d5c 100644
--- a/org.mixedrealitytoolkit.spatialmanipulation/ObjectManipulator/ObjectManipulator.cs
+++ b/org.mixedrealitytoolkit.spatialmanipulation/ObjectManipulator/ObjectManipulator.cs
@@ -4,6 +4,7 @@
 using System;
 using System.Collections.Generic;
 using Unity.Profiling;
+using Unity.XR.CoreUtils.GUI;
 using UnityEngine;
 using UnityEngine.Serialization;
 using UnityEngine.XR.Interaction.Toolkit;
@@ -69,7 +70,7 @@ public enum RotateAnchorType
         /// This enumeration describing the type of behavior to apply when a
         /// <see cref="ObjectManipulator"/> is released by a controller.
         /// </summary>
-        [System.Flags]
+        [Flags]
         public enum ReleaseBehaviorType
         {
             /// <summary>
@@ -135,8 +136,7 @@ public Transform HostTransform
             }
         }
 
-        [SerializeField]
-        [EnumFlags]
+        [SerializeField, FlagsProperty]
         [Tooltip("What kinds of manipulation should be allowed?")]
         private TransformFlags allowedManipulations = TransformFlags.Move | TransformFlags.Rotate | TransformFlags.Scale;
 
@@ -206,8 +206,7 @@ public bool ApplyTorque
             set => applyTorque = value;
         }
 
-        [SerializeField]
-        [Range(0.001f, 2.0f)]
+        [SerializeField, Range(0.001f, 2.0f)]
         [Tooltip("The time scale at which a Rigidbody reacts to input movement defined as oscillation period of the dampened spring force.")]
         private float springForceSoftness = 0.1f;
 
@@ -220,8 +219,7 @@ public float SpringForceSoftness
             set => springForceSoftness = value;
         }
 
-        [SerializeField]
-        [Range(0.001f, 2.0f)]
+        [SerializeField, Range(0.001f, 2.0f)]
         [Tooltip("The time scale at which a Rigidbody reacts to input rotation defined as oscillation period of the dampened spring torque.")]
         private float springTorqueSoftness = 0.1f;
 
@@ -234,9 +232,8 @@ public float SpringTorqueSoftness
             set => springTorqueSoftness = value;
         }
 
-        [SerializeField]
-        [Range(0, 2.0f)]
-        [Tooltip("The damping of the spring force&torque. A value of one corresponds to critical damping, lower values lead to under damping or oscillation.")]
+        [SerializeField, Range(0, 2.0f)]
+        [Tooltip("The damping of the spring force & torque. A value of one corresponds to critical damping, lower values lead to under damping or oscillation.")]
         private float springDamping = 1.0f;
 
         /// <summary>
@@ -248,8 +245,7 @@ public float SpringDamping
             set => springDamping = value;
         }
 
-        [SerializeField]
-        [Range(0, 10000f)]
+        [SerializeField, Range(0, 10000f)]
         [Tooltip("The maximum acceleration applied by the spring force to avoid trembling when pushing a body against a static object.")]
         private float springForceLimit = 100.0f;
 
@@ -288,8 +284,7 @@ public RotateAnchorType RotationAnchorFar
             set => rotationAnchorFar = value;
         }
 
-        [SerializeField]
-        [EnumFlags]
+        [SerializeField, FlagsProperty]
         [Tooltip("Rigid body behavior of the dragged object when releasing it.")]
         private ReleaseBehaviorType releaseBehavior = ReleaseBehaviorType.KeepVelocity | ReleaseBehaviorType.KeepAngularVelocity;
 
@@ -325,8 +320,7 @@ public SystemType TransformSmoothingLogicType
             }
         }
 
-        [FormerlySerializedAs("smoothingActive")]
-        [SerializeField]
+        [SerializeField, FormerlySerializedAs("smoothingActive")]
         [Tooltip("Frame-rate independent smoothing for far interactions. Far smoothing is enabled by default.")]
         private bool smoothingFar = true;
 
@@ -358,8 +352,7 @@ public bool SmoothingNear
             set => smoothingNear = value;
         }
 
-        [SerializeField]
-        [Range(0, 1)]
+        [SerializeField, Range(0, 1)]
         [Tooltip("Enter amount representing amount of smoothing to apply to the movement. Smoothing of 0 means no smoothing. Max value means no change to value.")]
         private float moveLerpTime = 0.001f;
 
@@ -372,8 +365,7 @@ public float MoveLerpTime
             set => moveLerpTime = value;
         }
 
-        [SerializeField]
-        [Range(0, 1)]
+        [SerializeField, Range(0, 1)]
         [Tooltip("Enter amount representing amount of smoothing to apply to the rotation. Smoothing of 0 means no smoothing. Max value means no change to value.")]
         private float rotateLerpTime = 0.001f;
 
@@ -386,8 +378,7 @@ public float RotateLerpTime
             set => rotateLerpTime = value;
         }
 
-        [SerializeField]
-        [Range(0, 1)]
+        [SerializeField, Range(0, 1)]
         [Tooltip("Enter amount representing amount of smoothing to apply to the scale. Smoothing of 0 means no smoothing. Max value means no change to value.")]
         private float scaleLerpTime = 0.001f;
 
diff --git a/org.mixedrealitytoolkit.spatialmanipulation/Solvers/Follow.cs b/org.mixedrealitytoolkit.spatialmanipulation/Solvers/Follow.cs
index ac030a838..3d76b65a7 100644
--- a/org.mixedrealitytoolkit.spatialmanipulation/Solvers/Follow.cs
+++ b/org.mixedrealitytoolkit.spatialmanipulation/Solvers/Follow.cs
@@ -2,6 +2,7 @@
 // Licensed under the BSD 3-Clause
 
 using Unity.Profiling;
+using Unity.XR.CoreUtils.GUI;
 using UnityEngine;
 using UnityEngine.Serialization;
 
@@ -69,8 +70,7 @@ public Transform TargetToFace
             set => targetToFace = value;
         }
 
-        [SerializeField]
-        [EnumFlags]
+        [SerializeField, FlagsProperty]
         [Tooltip("Rotation axes used when facing target.")]
         private AxisFlags pivotAxis = AxisFlags.XAxis | AxisFlags.YAxis | AxisFlags.ZAxis;
 
diff --git a/org.mixedrealitytoolkit.uxcore/Interop/UGUIInputAdapter.cs b/org.mixedrealitytoolkit.uxcore/Interop/UGUIInputAdapter.cs
index 26723be67..7b6db7aba 100644
--- a/org.mixedrealitytoolkit.uxcore/Interop/UGUIInputAdapter.cs
+++ b/org.mixedrealitytoolkit.uxcore/Interop/UGUIInputAdapter.cs
@@ -3,6 +3,7 @@
 
 using System.Collections;
 using System.Collections.Generic;
+using Unity.XR.CoreUtils.GUI;
 using UnityEngine;
 using UnityEngine.EventSystems;
 using UnityEngine.UI;
@@ -38,8 +39,7 @@ protected IXRInteractable ThisInteractable
             }
         }
 
-        [SerializeField]
-        [EnumFlags]
+        [SerializeField, FlagsProperty]
         [Tooltip("Which axes should be used for manipulation instead of navigation?")]
         private AxisFlags movableAxes = 0;
 
@@ -109,9 +109,9 @@ internal protected XRInteractionManager InteractionManager
         /// A Unity Editor only event function that is called when the script is loaded or a value changes in the Unity Inspector.
         /// </summary>
         protected override void OnValidate()
-        {   
+        {
             base.OnValidate();
-            
+
             // Validate that no transition type is set. You shouldn't be using this
             // for any sort of UI visuals; use a StatefulInteractable and a 
             // StateVisualizer instead, even for UI.
@@ -416,7 +416,7 @@ protected IEnumerator Move(Vector3 objectLocalDelta)
                 }
             }
         }
-        
+
         /// <summary>
         /// Called when the Unity UGUI element is selected.
         /// </summary>