Unity Editor 2018.4.20f1 - Editor Window on Macintosh is translucent and empty

I attempted to open up the Unity Editor on a Mac t$$anonymous$$s morning, but the client area of the window holding the editor is translucent. There are no contents visible in the window, just whatever is below the editor in whatever's on the screen at the moment. I've tried shutting down and restarting Unity to no avail. The Mac OS on the mac$$anonymous$$ne in question is 11.4.