Samsung Gear S2 classic User Manual page 27

Basics
Deleting notifications
Delete a notification by swiping upward from the bottom edge of the screen while
viewing a notification.
Blocking notifications
1
Select a notification from the app you want to block.
2
Tap the notification to view the details.
3
Tap More options, rotate the bezel to Block app and tap Block app.
The Gear no longer receives notifications from the app.
You can block notifications from specific apps on the Gear. When you have not
received any notifications on your Gear, block notifications using your mobile device.
On your mobile device, open the Apps screen, tap Samsung Gear → Notifications
→ Manage notifications.
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