BEGINNER- metronome

hello!

OK so every time I change the metronome pattern ex(4/4… 2/4) in clicks… it tends to stick that way through the song when i really just want to use it to use it at that time. Can anyone help me undo this so i can just play with metronome to the setting i want and than put it back with ought all the changes.
THANK YOU SO MUCH!