Just in case you were not aware, Focus is synced to all devices logged into the same Apple ID so, you may not have set it on your MBA but likely it's set on one of your devices. Editing it on any device edits it for all.
I have a nap between 1600-1700 every day so I set Do Not Disturb on my iPhone for 1530-1730. That silences my MBP, Apple Watch, iPad and iPhone even my Apple TV.