I thought I remember that under settings > sharing you used to be able to make the app copyable.
Is that still a thing?
Yes, it’s exactly where you suggested.
If you don’t see it, your app may have been created from a template. You cannot make templates copyable publicly.
I am sure that I did not create any apps from template. However I did duplicate my own apps. Does duplicating your own app classify as a template?
No, not unless it was a copy of a copy of a template.
Can you please send a support link to support@glideapps.com so I can take a look?