If you want to just lift the whole door up then loosen all 3 allen bolts and this allows you to lift, then lock them back off, to move the door sideways then one hinge at a time loosen the bolt off and then turn the hinge pin from the top, you can use a hex screwdriver bit holder for this if you have a hex ratchet
If you prefer a visual demonstration of the above, here's a rather ponderous video with some dubious use of a Stanley blade, but it shows well how the hinge behaves - try viewing from around the 5 minute mark...
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