When you change the personalized theme in LibreOffice 6.2 on Windows 10 the color of the new notebook UI doesn't change at all and stays grey. This kinda defends the purpose of themes with you wanna use the new notebookbar. Turning OpenGL/Acceleration on and off doesn't make a difference.
Notebookbar remains grey
Should change to the personalized theme
User Profile Reset: Yes
OpenGL enabled: Yes
Created attachment 149019 [details]
screencap showing the bug
Confirmed on Windows 10, but I'm not sure if this is a bug and should be changed.
*** This bug has been marked as a duplicate of bug 121877 ***