I want to use Black Bar mode with 1024x768 resolution anywhere.
I switched radeon settings-> display-> GPU Scaling (ON) -> Scaling Mode (Center)
On the desktop it was applied, but did not work inside the game.
It worked in the game as a full panel. (CSGO, R6S)
Also I want to use 144hz anywhere.
Driver Packaging Version
Try the latest Crimson Beta for the Win 10 Fall update.