Can't remove time machine drive
Hey gang.
I am trying to do two things with Time Machine on Catalina and can't do either:
1) I can't "turn off" Time Machine. There used to be a button but I don't know where it went.
2) I can't remove one of the drives currently assigned as a backup. In this case "Old Backup". In the main pane, it still shows up, yet oddly enough, when I click "options" it's not in the list.
Thoughts?
iMac 27", macOS 10.14