1. Fetch ONLY a specific branch from a fork repo:

   git remote add <FORK_NICKNAME> <PATH/TO/FORK>
   git fetch <FORK_NICKNAME> <BRANCH_TO_FETCH>
   

2. Undo all fetches from the fork:

   git remote remove <FORK_NICKNAME>
   

3. Disable accidental push to the fork by setting push URL of the fork remote to a dummy value:

   git remote set-url --push <FORK_NICKNAME> no_push
   

   • "no_push" has no meaning here; just some non-URL

References:

• https://stackoverflow.com/questions/35591887/how-to-undo-git-fetch
• https://stackoverflow.com/questions/10260311/git-how-to-disable-push