I cannot use cursor arrows to manage screen size. Neither do most of the "window" sizing work.

I just have to open Lightroom, let it load, and then go to “windows” menu. The only one that works is the minimize menu. At the same time my external disc in which I keep my Lightroom library does not link. I receive “file not found” when I try to develop. I use a MacBook Pro. The operating software is Tahoe 26.5.2.