A calibre library is a directory (folder) with a metadata.db file in it, and a hierarchy of author and title directories (folders) containing cover.jpg, metdata.opf and format files (.epub, .mobi, .pdf etc).
If you have such a thing use the calibre Library icon->Create/switch library... tool to browse to it, and select the Use the previously existing library at the new location option. If you want it in a different location use your file manager to copy it to where you want it first.
BR
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