It is described in our Flight Manual:
To access the AN/ALE-40 programmer panel in single seaters, press the “RCtrl + Num0” key combination to lock the snap view and then press “Num5”. The canopy should be open, the aircraft stopped on ground and the engine off to manipulate the panel. Press “RCtrl + Num0” again to go back to normal view. “LWin + Num5” shows a snap view of the panel.