be able to change main library

I do not use iTunes (have had to rebuild my database a few times from iTunes losing my music or thinking it knows more than me (it just wonts to sell things to me anyway) any chance of removing and editing the library that is there?

also what are the metadata ids can’t seem to add to grouping at all (does not matter if it is there it is not imported)?
and Flac will not import all data?