Tool bar

Support Basics & Interface
1

How to set Tool bar (T) to to the right of the screen.
Blender 2.9

2

hope this is help you

3

Flip region is disappeared
Unfortunately no lefthanded blender 2.9 support anymore.

4

For 2.9 Series. You need to have Developer Extras on. Then you can follow the 2.8 series directions.

I just test on 2.9 and it work

5

Awesome I wil activate developer extra options