Mirror View Around Cursor is ‘Alt+M’ in the default shortcut settings.
It flips the canvas around though which can send it off the edge of the window and it’s only horizontal mirroring.
Is it possible that this hasn’t been incorporated into the Windows package yet?
If it hasn’t, you can raise a formal bug report for the admin oversight.
Edit:Add: It’s not in the Feb 12 5.0.2-alpha ‘Stable’ appimage.
Alvin has said that it’s in the master (and therefore in ‘Next’) but will not be in ‘Stable’.
I suppose it will be in Stable and formal release one day soonish after decisions have been made about it.
I’m happy that it will make it to stable soon. I’ve been on Krita Next from the time AlanArtsLog and the Devs merge it to now [its quite stable for me]. Updating it on weekly basis. It honestly has help me alot that I switch my mirror mode to it [exclusively] and couldn’t live without it anymore.