Why can't I delete

Hi Patriciap,

I assume you are accessing those forms in mobile app Adobe Acrobat DC? Also, are you willing to delete the forms from the list automatically after some time?

Please provide more information for better understanding, as we are not clear using which application and from which location you want to delete that?

You can do that manually- Acrobat Reader Help for Android: Managing files and folders

Regards,

Akanchha