In all previous versions of SketchUp, it’s possible to increase or decrease the number of segments of an arc by tapping Ctrl + or Ctrl -. You could previously hold Ctrl and tap the + or - as many times as needed to get to the desired number of segments.
In SketchUp 2022, in Windows 10, it’s now necessary to release Ctrl between each segment change. So now it’s Ctrl +, release, Ctrl +, release, etc. (It used to be Ctrl + + + +, release).
This new way is very annoying. I’m hoping it is an unintentional bug, and not a purposeful change.