I'd like to fly my drone inside my arena, which has ceiling rafters approximately 10 meters from the ground.  Is there any way to force the drone to stay at an altitude of 8 meters and temporarily ignore ascend/descend inputs? Alternatively is there a way to at least force the drone to stop at max altitude instead of just giving a warning?

I'd like to be able to fly looking at the camera feed without worrying about accidentally ascending into the rafters.

Hello there OntarioPaddler. Thank you for reaching out and for giving out these information. Just a reminder that DJI do not recommend flying your DJI Mini 3 Pro drone indoors as the environment indoors may have interference and caused an incident and also during low light condition as the vision sensors may not work properly. DJI suggest to choose an outdoor open area where the GPS is good, no magnetic interference, to fly your DJI Mini 3 Pro and check if all the functions are normal. Thank you.

It will stop at max altitude but im not sure if the height you require is actually high enough for the software?