I just updated to Xcode 13.0. Now every time I choose a file in a File Review window/tab, Xcode decides I want to see line numbers.
I have line numbers turned off in Preferences. And since I am using a GUI, and have side-by-side comparisons on, there is no reason I need line numbers. They take up space and make a side-by-side comparison less useful.
There doesn’t appear to be a preference, is there a CLI default I can set?