Ever since I upgraded to Catalina & have been struggling with clearing the grouping field.
I don't use it. I have very specific tagging habits & I don't like any information in there that I didn't put there.
Very often, having ripped an album, the grouping field will contain something random (& often hilarious) that I then delete by selecting the album, typing command-i, putting the cursor in the field & typing delete.
When I OK that, something different will have been put in the grouping field & I often have to repeat this process several times for it to stay cleared.
I get that Apple may be wanting to do their very, very helpful thing of doing stuff for me whether I like it or not, but this is a bug, surely?
When I first select the album & go through the tags, if I clear that field it should stay clear.