A printing apparatus includes a printing unit that prints on a printing medium, and a discharge tray that is movable, by a motor, between an accommodated position and an extended position. An external tray is detachably attached to the printing apparatus. An operation unit displays a screen on a display screen to receive a moving instruction for moving the discharge tray, and confirmation of removal of the printing medium from the discharge tray. When the operation unit receives a moving instruction for moving the discharge tray from the extended position to the accommodated position, a control unit moves the discharge tray after receiving confirmation from a user, via the screen, that the printing medium has been removed from the discharge tray, and, when the external tray is attached to the printing apparatus, the control unit does not move the discharge tray from the accommodated position to the extended position.