Close your project
Open json file you have in your project folder with some text editor
I for example use notepad ++
Find project Uuid line
Delete whole line
Save changes
Open project in gdevelop and you gonna get automatically new Uuid
And now it will act as new project instead of it being same project
Projects are per Uuid and not per folder/name of project
Imagine like your account here is not per name you make for yourself
But per email to which you register your account
That is why you cannot register more than one acc to one email address
Versions v5.5.220+ should help with that.
When introducing the new view, the confusion was clear that when duplicating a game, we were keeping the link to the game that is published.
Now, when duplicating a project, you’re asked if you want to keep the link to the game.
It should help with your process.