From the description above I understand that you need to cancel your subscription, If yes, I'm here to help. Please follow these steps to initiate the cancellation from the Adobe Acrobat Reader app:
Tap the profile icon.
Tap Subscriptions.
Tap Manage subscriptions.
The App Store will open, and you can complete the cancellation process there.
For more detailed guidance, you can visit the Adobe help page.
Let us know if you are referring to something else.