Nowadays, the general wooden door, aluminum alloy door has a pulley on the top side, the pulley and the sliding door is a pin type connection.
Lift the sliding door upward slightly, and use a screwdriver to the side to disengage it.
Remove the pulley on the other side in the same way, then lift the sliding door upwards so that the lower end of the door leaves the locating pin, so that the lower end of the door first outward is removed.