Is it possible to make an application’s window smaller than intended? I’ve always had issues with some application windows in macOS where I can’t make them smaller than a certain amount.
Audio Midi Setup is the perfect example of this.



If you look at the image posted, you’ll see that there’s no reason why it shouldn’t be shorter, there’s a lot of vertical space which is absolutely pointless.

Airdroid, same story, lots and lots of wasted space.

I find this infuriating as I really need some windows to be smaller in order to have my desktop tidy and the apps easily accessible without having them overlap.

Does anyone know of a way to “force” an application’s window on macOS to be smaller?

Thanks!
No.

You can't force an app window to get smaller than the minimum size it is programmed to be. There's no 3rd party app or macOS feature that can let you do otherwise.