Usability issue: switching light/dark mode requires scrolling back to the top of the page

[constb]

Enter your suggestions in details:

While reading a docs page, I decided to switch to the dark mode. But the mode button is not in the right section, it's in the navigation and navigation is hidden unless I scroll to the very top of the page, loosing the position I was reading at.

One possible solution would be to move mode switch to the right section (where ToC is). Another is to make navigation reappear whenever user starts scrolling upwards.

Other options to improve mode switching that come to mind are:

1. Add the "system" mode option that follows the light/dark OS setting, like the one is MacOS.
2. Add a hotkey to switch mode.