My color-coded menu tree disappeared since the last Obsidian update. How do I get colors back?

I use theme villeplum and liked it a lot. But now, as the color-coded menu tree on the left side vanished, it looks depressive with not enough contrast.
As many of you use AnuPpuccin, I downloaded this theme, but same here. I found no way to color-code my menu tree. I found Style Settings and played a bit around with it - but still my menu tree looks at me one-colored and depressed.

How do I solve this? Thanks in advance to anyone who gives me advice.