[F-R]Add dark mode switch in a comfortable position

[Palloxin]

Add the dark mode switch button here: it should be like this:

https://user-images.githubusercontent.com/75091899/165906291-1025ad25-7faf-4612-8d8c-8155d7bf10db.mp4

it would be more comfortable and aestethicly better, in my opinion.