How To setup Transmitter with auto center-throttle with apm to fly like dji?

I have a FlySky i6s with auto center-throttle. I don’t want to remove the spring. I just enjoy the dji mavic pro experience to fly with only throttle up or down slowly to raise and decrease the altitude. is it possible to fly like this in apm? I just searching in the internet, IMHO the mode that DJI using is Loiter Mode. true??

additional information, I use F450 frame and APM 2.8.

I’m sorry for my bad English. hope anyone can understand it. thank you