There is a section under tools called “Audit Logs” and if you audit a domain and you want to un-audit the domain you have to remove the domain manually from an entry in a text/database file (the type of file depends on the version of Pi-hole) and this may be hard to do for some users, so it would be convenient to have a section under the audit logs that lists all of the domains and beside each listing, it should be a delete icon that will delete the domain from the list of audited domains.
Adding a simple way to un-audit domains would help people who are not as experienced with Pi-hole/Linux.
Some additional info: How to clear the audit log?, [Suggestion] Add a way to un-audit domain entries in the Pi-hole web GUI (AdminLTE) · Issue #1191 · pi-hole/AdminLTE · GitHub