How to delete my App?
You can delete an application from the App page or while editing your app attributes.
When you delete an app, you are prompted to remove the app definition and/or drop supporting objects.
On the Workspace home page, click the App Builder icon. Select an app. The App home page appears.
After that, verify the app ID and name at the top of the page.
On the Tasks list, click Delete this App.
When prompted, click Delete. Your app will be permanently deleted.