You can delete catalog files the same way you delete any other file on your computer – by using the File Explorer (Windows) or Finder (Mac). Catalogs can't be deleted from within Lightroom.
You probably want to delete the whole catalog folder for each one, the folder also contains Library previews (as well as Smart previews) that can take up a lot of space.
Just make sure that you don't delete your working catalog.
If you are never going to use the photos in these catalogs again, then you can delete them. Please understand the implications ... all the work you did on your photos (edits, user-provided metadata, photobooks, slideshows, collections, etc.) in these catalogs gets deleted as well. So, is that what you really want, to lose this work?
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