from a specific page on the central admin page, you can show what sites our solution feature is activated on.
Open the central administration web application.
Click on SPARK Forms Builder Management link
Click on License Activation Details link
You will have a page that lists all sites/site collection/web applications that have SPARK Forms Builder Feature activated on.
If you clicked on the Deactivate link, you will open that specific site features page.
Check out below screenshot.