Clicking noises - why and how to remove?

You can use Punch Copy/Paste.

https://forum.audacityteam.org/t/punch-copy-paste/28906/1

This was designed to quickly and easily cover up “simple” noises such as yours. It’s still manual one-by-one, so we still have to find where they’re coming from, but the action is a lot simpler (we assume).

I’ve never used it, so I can’t give you the Quickie/get-out-of-jail/CliffsNotes description.

Koz