I'd call that "not making publicly available" via the library system rather than banning. As parent said, you can still buy these books and share with or sell them to each other.
I'd call it "banning books from public libraries", since that's a clear description. Contrary to what GP claimed, this is indeed public libraries, not just school libraries.
Whatever you want to call it, IMO public libraries shouldn't ban books, especially based on some radical PAC's opinions about what jesus would want or whatever.
The linked censorship search portal [0] lets you filter by "# Count of Challenges at Public Libraries" > 0.
0 – https://www.ala.org/bbooks/censorship-search-portal