How to deal with an insufferable prick being the supervisor?

I have 19 days more working with this mentally ill person who somehow doesn't get fired, give me strength. He's constantly trying to pick fights, harassing employees to get a reaction, micromanaging, raising his voice, acting super anxious, stirring drama, micromanaging, yelling at people for minor mistakes, telling people what they can and can't do, throwing people under the bus, reporting to the boss for minor mistakes, and worse.

It's an absolute nightmare to work with him. Absolutely insufferable. In 19 days I resign so everything will be fine at the end, but how do you put up with this walking drama every day?