DJI hasn't made consumer drones with user-selectable Atti Mode for many years.
Atti Mode is what you have when your drone doesn't have GPS reception (and is unable to use the downward-facing sensors to maintain horizontal position).
Atti Mode =...
On a Mini4P Atti is only a mode that it goes into when GPS signal doesn't meet minimum requirements - AFAIK it is not manually selectable using the regular controller / software.
However that should not cause you great problems flying indoors IF...
A private prison has opened a large immigrant detention center in rural Michigan. I plan to photograph a rally against the detention center on Friday. The problem is that the center itself is in the woods, and not visible from the public road...
You need to CAREFULLY examine the Laws in the area and the FAA Regulations for flying near a place designated as "Critical Infrastructure" I would also look to make VERY SURE that no TFR's are put in place!! You can almost guarantee there are...