The app interface is a little different, depending on whether you're using an iPhone or an Android. Here's how to remove a trip from your watches on both devices!
If you're on iOS:
Tap on the watch you're no longer interested in receiving notifications for.
From here, press the "Watching" button to toggle if off. You'll know that you've stopped watching a trip once it's advertising that you "Watch This Trip" again. 😊
If you're on Android:
Head to the "Watch" tab at the bottom of the app and tap on the three vertical dots next to the trip you'd like to stop watching.
From here, you can tap "Stop Watching This Trip" and you'll no longer receive notifications for that trip.