Is there a way to clear all notifications at the same time? Or are we stuck with clearing one at a time?

Yes, I would like to know if this is possible too. Kinda dumb to always have to clear one at a time. 

Reviving this thread - anyone have any ideas?

At this point clearing all notifications on the phone will clear them on the device... at least for iOS. 

Don't get your hopes up that Garmin will implement this feature unless enough people write in to request this, but I'm not sure through which channels that is done.

Yes, the same for Android, clearing on the phone will do it. I was mostly hoping there was some widget or something for this. That's probably not feasible.

This would be a great feature to implement. Removing all notifications one by one is a hassle particularly if you have group chats or news 

This would be very nice indeed

Would love to see this feature added!

Hello! I will add you to a feature request that we have for clearing all notifications at one time on the watch! There is no guarantee that this change will be made, but we do hear you guys and appreciate user feedback on how we can improve our products and your customer experiences. 

Works mon iPhone indeed! Great, thanks.