let it/(one) be
To not interact with or bother someone or interfere with something; to leave someone or something alone. I know you want to help, but he needs some space right now. Just let him be. I was going to try to fix the printer but I figured I would just let it be until you got here.
Let it be.
Leave the situation alone as it is. Alice: I can't get over the way he just left me there on the street and drove off. What an arrogant pig! Mary: Oh, Alice, let it be. You'll figure out some way to get even. John: You can't! Bill: Can too! John: Can't! Bill: Can too! Jane: Stop arguing! Let it be! That's enough!