in calibre , click top left calibre library icon. that shoudl tell you the name of the calibre library ( which is probably calibre library).
also, if you look in documnets, the actaul calibre library is the folder that has author subfolders
the " calibre2 folder is maybe a copy of the config data that you put there by mistake if so it will have lots of files of type json, pickle, py...
calibre - preferences - misc - open config directory will show the active config directory, and its location. if that is isn app data, then you can safely delete the one in documents as its not in use
once you get used to is, its not too complicated. many other apps use the same system: user preferences are stored in a folder in app data, and the relevant media ( books , music, videos etc) are stored elsewhere.
e.g.1. my music player for local files is foobar2000. the preferences for that are in app data/roaming/foobar.... the music files are in My music
so to install that app on a new PC, I copy over the app data folder, and I copy over my music files..
e.g. 2. My email program is mailbird. To copy that to a new PC, with all my settings and history, I copy over the app data roaming mailbird folder and I install the current version of that app
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