Thanks for the reply. I'm persevering. Can't see "preferences" in tools. Most of it seems pretty irrelevant. As in most software, most people will only ever use a small percentage of what's in it. When clicking to find artwork I've been using Go to Internet but when that finds nothing I've now tried Autotag and that invariably finds something via Musicbrain which I can copy/paste in. Looks as if Musicbrain would be a good choice to have in the Internet find list as I think it would give a much higher percentage of hits than most of those there as current default. I see that Discogs is also there too but can't be selected.
There certainly doesn't appear to be any way that I can let MB go out and search automatically in order to fill my gaps. Perhaps I'm asking too much as it would need an algorithm (?) to run through my list.
There are other annoyances, such as a new artwork suddenly replacing previously found art for the same artist. I gave up with Bjork and Dream Theatre!! I'd also prefer to find cover art only rather than picture of the artist or something completely random from Google. Deleting these or wrong art should be select/choose delete rather than going through a couple of pop-ups, the first one of which sometimes comes up in different format with no delete on it. Artwork is also very small when found so often not recognisable if you're not familiar with it. Lots of stuff I have is pretty obscure. It's been filling up my HD for over 10 years so perhaps not surprising.
Apologies for covering a lot of ground but being new to MB or any similar software, it's one step at a time for me. I'm also old................