Mavlink Message from Joystick, PX4 orange cube with Mission Planner

I’m working on a PX4 orange cube, a Joystick and Mission Planner. The orange cube is linked to my computer and the Joystick also.
I have trouble to find Mavlink messages from the joystick throught Mission Planner. Is it possible ? and if yes how can i find messages send by the joystick to the computer ?

Thank you for your help and sorry if the question is basic, i’m a beginner.