To delete an app project built with Thunkable's legacy snap-to-position builder, you must delete it from your projects page at x.thunkable.com.
You can also delete an app project built with Thunkable's drag and drop UI from your projects page. However, you can also delete a drag and drop project that you have open directly in the browser.
To delete a project from your projects page (legacy and drag and drop)
Go to x.thunkable.com
Find the project you wish to delete
Click on the three button menu
To delete a project that you have open in your browser (drag and drop projects only):
Look to the top right corner of the project page
Find the Project Actions menu
Click Delete project