In WMR APP’s Settings: Environment>Clear Environment Data
It may need the Floor Height set again with the Right-Controller in HOME which is weird to use but you’ll get there. For times you can not access HOME then you must use the WIN+Y to get it. Else you never need HOME nor WIN+Y for anything as you use ALT+TAB to switch in/out VR (better in MSFS to make this ALT+SPACE instead)