Since you say you want to keep the books around that implies that you cannot actually delete them.
What might satisfy your requirements is to;
- add a tag to identify books to be hidden.
- set up a Saved Search to only show books without that tag
- set the Saved Search as a restriction so that you normally do not see such books.
You can always cancel the restriction if you want to make such books visible again.
The only other option would be to save books outside the Calibre library so you can delete Calibre's copy.
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