How do i lift a upvc door off a flag hinge? ?

I need to remove the front upvc door for the delivery of fridge/freezer. The door has a upvc flag hinge as shown below

https://www.upvc-hardware.co.uk/hing...or-hinges-154/

from what i can gather from searching the net i should simply open the door and lift it up. The door should slide off. I tried it but either the door is very heavy or there is something preventing it from lifting. Don't want to use force.

Can anyone give some advice?

Thanks