Map Offset function visibility

New user, but spent a long time searching for the map offset function with no sucess. Map Manager, select the map (offline). Selected map text is red. Where is the Menu? By the map selected there are 3 dots, details, centre map, backup, delete. Top left of the screen 3 dots with Blank maps, refresh list,display wms tab, settings, user guide. Settings has a sub menu but no "more functions"

I saw a post elsewhere that this feature may be removed, but i was hoping to correct a GPS position error.

Redmi 5 plus android phone running Android 8.1.0