If you're using the free trial, you will not be auto-enrolled when it ends. You will receive a prompt to purchase a subscription. If you choose not to subscribe, simply do nothing.
If you have a paid Android subscription, follow these steps to cancel:
1. Open the Google Play Store
2. Tap Menu / Account / Subscriptions
3. Find your LandGlide subscription'
4. Tap cancel
If you have a paid iOS subscription, follow the instructions in the link to cancel: