I see how to disable the motion alerts but not for just one phone while leaving the other phone able to see motion alerts.
Good question, @cmstinson! Notification settings are specific to the device connected to Ring, rather than your actual Ring Doorbell or camera. For instance, if you activate notifications on your phone, they will not be automatically activated on your tablet. Instead, you have to manually designate your notification settings for each device connected to Ring.
This is the same for Shared Users. If you add a Shared User who wishes to not receive notifications, they would need to toggle this themselves, as your notification preferences would not carry over to their device. Check out our Help Center article for more tips on controlling notifications. I hope this helps!