hide "create new content"-button in border-column for specific user-group (f.eg. simple editors) in TYPO3 BE

Question

I'm on TYPO3 12.4 and trying to hide the "create new content" button or the hole column "border" in TYPO3-Backend for a specific user-group (editors). It sounds like a simple task and also chatgpt gives you a lot of advice but that never worked. (Sideinfo: I'm using bk2k/bootstrap-package)

Anybody did this so far and has a working solution ?

Many thanks in advance !