Amplifying on dwanthy's post, sort the tag browser by popularity to get the 1-entry tags together, select all books in the library, bulk-edit metadata, then enter the one-entry tags into the tags-to-remove list. Completion will help you enter them quickly.
Alternate approach: use right-click in the tag browser to rename the 1-entry tags to DELETEME. This is easy if you put DELETEME into the clipboard and paste the value into the rename box. When done, delete the DELETEME tag.
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