To cancel a subscription, ensure that you are signed into the Google account that you used to purchase the subscription, then follow these steps:
- Open the Google Play Store app on your device and tap the menu icon at the top-left corner, or log into https://play.google.com/store.
- Tap Subscriptions or My Subscriptions, then tap Cancel for the subscription.
- Tap Cancel Subscription to confirm.
The Google Play Store will confirm that the subscription is cancelled. At this point, your subscription is cancelled and your access to the Pro features will stop at the end of the current billing cycle - you won't lose any time on your license for doing this, it will simply prevent further automatic billings.