I tried but it did not fix the issue.
I should explain better. What I should have said is:
Close Lightroom, then rename the preference file, then open Lightroom. Does that work?
I exactely did what you say.
It resets LR preferences, but the crop overlay options remain light grey and non-selectable.
Crop overlay settings are only available when the crop tool is active.
Make sure the overlay display is set to Auto or Always (press H to toggle between always/never)
You may have deselected too many options for the O to cycle through (preferences reset should have fixed this?)
With Crop tool active click on Tools menu -> Crop Guide overlay -> Choose overlays to cycle ...then confirm 3 or more options are checked
I tried to use it without activating the crop too... thank you both to support!