Since Android 8(Oreo), an app that uses background service needs to display notifications. You can turn off this notification.
General Android
- Settings > Apps & notifications > iSharing > Notifications > disable "Location Update"
Samsung
Android 12+
-
Settings > Notifications > Recently sent: more > iSharing > Notification Categories > disable "Location Update"
Android ~11
- Settings > Notifications > iSharing > disable "Location Update"