Turn your autofocus off. That's why there is a lock exposure/lock focus button.
You need to do more than see the tutorials, you need to WATCH them. ;)
As far as majestic mode, anyone who has used a Movi Pro or earlier knows this is the default mode the gimbal uses. I assume this is Freefly's branded name for the normal shooting mode.
I bought one and love it, nice thing is you can run your iPhone off the USB C on the Movi, I get 4 ish hours of shooting...then you can swap the batteries for another set and shoot another 4 hours.
Once you balance the phone you can move the sleep screen to the balance line which makes each time you reinsert the phone easy and repeatable.