To give a friend access to a copy of an application:
Ask your friend to invite you as an admin to one of their teams, navigate to the team where you have your application (not the template folder), duplicate the application, move the application to your friends team, remove yourself as an admin of your friend’s team (either you do or they can do it).
Just to test, I have created another Glide account for a different email I have and invited my original account as an admin (the one with the arrow is the original account where I have the app I want to share):
A Glide account has teams (with a given pricing plan).
Each team contains folders.
Each folders contains apps (also known as projects).
When you click on the down arrow next to the name of a team you should see a dropdown list with all of your teams. There you should see a team called “Joined with …”.
The problem was that I had these 2 Gmail accounts logged-in on the same Chrome browser and it made a mess.
Once I have realized that and handled it was able to follow your instructions and get the result I was looking for - being able to share my app with a friend.