A hinge has two leaves — Mk7 hinges have one bolt per leaf, = 4 per door.
The outside appearance suggests the internal and external sections move together when the bolt is loosened — probably there's paint holding them to the panel both sides.
When adjusting, remember that the hinge pins need to be fairly accurately aligned to prevent panel distortion.
It doesn't look as though there is an internal bolt — would make assembly tedious and designers would get the rounds of the kitchen for that.
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