google search console – Major CLS issue – Can´t locate it at all – Core Web Vitals – All Pages effected

since a few weeks already I am trying to fix my CLS-issues. My sitemap contains of 150 single pages in total. All of those 150 pages are affected by BOTH the Mobile and Desktop CLS issue (>0.25 & >0.5).

Taking a look at the Lab Data all pages are good, CLS and performance-wise.
Also, working with the Web Vitals Chrome Plugin it doesn´t show me any issues even when interacting for minutes with the site.

Has someone a different approach/way to find CLS issues?

Any help is appreciated.
Thank you!

Tim