OK ... bit confused now. You say you have the map rectangle at the bottom left corner of the Go 4 screen - yes? I'm not sure what you are referring to when you say "map option on the menu is greyed out".
The map won't show the drone position etc. until the GPS lock is completed. That's when the voice prompt from the controller tells you GPS lock is complete, and the Go 4 app' shows Green at the top-left of the screen with the message 'Ready to Go (GPS)'.
Do you have a GPS lock with everything on and connected? - as you may not get accurate GPS in your house ...???
Again, I apologize for the confusion. I'm sure it's my confusion that's confusing you.
I was referring to this:
"If you touch the 3 spots at the top right of the Go 4 screen, you'll open the 'General Settings' menu (which should also have the 3-spots highlighted at the bottom of the icon list).
On that page, there is a 'Map' section, with the first switch being 'Show Flight Route' ... Is that switch on???"
Maybe I should wait until I can get outside and a good GPS lock to verify the switch is set to "on". That switch is greyed out. (Hard to see in the photo but it's not in bold font and can't be switched.)