📂How to display the app on specific collections?

Select "Choose by Collections" and then either click include selected collections or exclude selected collections. That radio button click opens up a collection selection modal.

If you click "include" and select the collection, then only products in those selected collections will have the app. Once "exclude" is selected, then the app will be displayed on all products expect products under those selected collections.

If a product is under multiple collections, please pay attention that even if one collection is met with the criteria, then that product will be in the list or out of the list based on your selection.