Solved:
The dev updated the theme (I am using Kripton https://github.com/EliverLara/Kripton)
So I want to get rid of these grey boxes that got added to everything in the overview. They are in the bar as shown in the image, they are in every text in the overview search as well.
For my taste it is disgustingly ugly. And I can’t find where I can make it go back to normal.
That would be it, GNOME 46 moved a lot of things around and GNOME 45 themes are no longer working.
This is the reason why the GNOME team discourages third party themes.
Thank you so much! The dev updated the theme (I am using Kripton https://github.com/EliverLara/Kripton)
Looks much better, enjoy!