If your software supports joystick control - then in the status line there a small joystick button is shown.

The X, Y, F indicates that the 3 axis joystick controls X and Y position and Focus.

Alternatively X, Y and Zoom can be controlled – then the text will be X, Y, Z.

Double click the button to configure the (optional) 6 buttons on the joystick.

A panel will pop up – each button function can be selected.

An example of setting the function for button 5.

When mouse hovering the button a balloon will show the current button configuration.