Tree view: red cross

I currently cannot see the tree view. It has been replaced by a big red cross. I searched a lot and tried the following solutions, none of which worked:

This occurs in both our company's Azure SQL database as source, as well as the original datasource (forgot the type)

I'm now forced to use the details or large icons view, which annoys me to no end.


Additionally, I think because of this issue (at least I would not have to face these problems anymore), I encounter the following other problems: