I'm running Pop!_OS 19.10 with KDE Plasma (5.16.5). I am using the Breeze Dark theme (which comes standard with Pop).
I just want to change the title bar color, but I am not sure how this is done. I don't want to break the existing theme, but I'm not sure how to clone an existing theme if that's possible.
Where in the theme file/folder directory is the title bar specified?
The answer referenced by Roj worked for me.
Created: /home/UserA/.local/usera.colors which contains:
[General]
Name=UserA_TitlebarTheme
[WM]
activeBackground=140,69,211
inactiveBackground=80,40,120
Kudos to Roj!