When copying an App, allow the designer to customize the Url slug, rather than default “Copy”
When you make a copy, you can write your own and new app name.
Could you indicate where this option is located? I just made an additional copy and was not presented with an option to define the Url, not did I find this under any of the Manage pages on the new copy.
When you make a copy it asks the app name. When you add a name, it will use it for the URL like …NewAppName-123456