Start DJI Go4, and go to camera view. Tap the 3 dots in the upper right corner. It will show "General Settings", but on the left edge there are several icons, for the aircraft, the controller, HD, Battery, etc. Tap the top one which is the aircraft. It shows "MC settings" and the bottom entry is "Advanced Settings". Tap the little arrow on the right. The first entry is EXP and that arrow will take you to the settings you are looking for.