To get the full effect you need to use WB 11 and Start 11, and you will be able to change the look a feel of your desktop.
I am a user of StartAllBack, and this is intended to be used with Themes, using a Theme Patcher like UltraThemePatcher, and then Themes. In screenshots of the month, all my Topics are Mostly Themes using StartAllBack. I too had issues at the beginning using Themes, but i found it was the Patcher i was using UXTheme Patcher, the one listed above was 100% more stable for me, now i run dozens of Themes on my Win 11 System, with no issues.
The safest way to theme your desktop without much risk, is WB11 and Start11. Themes and the way they are used, are better suited to advanced users, who know how to recover things should they happen.