This page allows changing the PID controller gains to better suit your vehicle and application. Changing these may help you get a snappier response for more precise movements, or a smoother response for recording cinematic footages. Adjust a parameter by moving the desired slider, or by clicking the increase/decrease buttons. There are three controllers that can be adjusted here:
Attitude Controller Parameters are the parameters for the controller responsible for keeping the vehicle oriented as you want it, assuming your vehicle has ability (enough motors/DOF) to do so.
Position Controller Parameters are the parameters for the controller responsible for positioning the vehicle at a point in 3D space. The Z parameters control how the depth control works (eg in Depth Hold mode). The XY parameters affect how the vehicle controls the horizontal position in Position Enabled modes.
Waypoint Navigation Parameters are the parameters for the controller responsible for following waypoints in Auto and Guided mode.
Guided and Auto modes are currently unsupported and some features are disabled in QGC.