How do you guys deal with Micromanaging from supervisor?

TLDR: micromanage from supervisor and no one is doing anything about it not even upper management's.

Its come to the point of them wanting to know everything about what you're doing even about going to the restroom (yes they've asked someone why they're constantlygoing to the bathroom). Also limiting people from doing their job if it means its "disrupting" what you're currently doing. Even tho what you're doing and what another employee is asking are related to the job?

Its come to the point where people have told me they no longer feel comfortable coming to work because they're not allowed to do or go anywhere even if it pertains to their job. Mind you this is one supervisor that should have zero say what others do but acts like they do. It feels like they want to put a wedge into communications with departments and how no one should be talking to other departments.

Each department has their own manager and/or supervisor yet they want to control every department as if they're in charge of everyone. Its causing more confusion and delays than anything. Idk how upper management's hasn't gotten involved already. I guess once we get hit with negative reviews and calls from customers is when they're gonna stop it byt why wait so long.