It looks like all doors have a strange feature: once opened in "modify openings" they get "keep proportions" permanently ticked on and that's the end - sizes get updated into something irrelevant and can't be adjusted.
How do I disable "keep proportions"? Or at least what is the purpose of it that I don't get?
It has made me keep all the doors shut because if I open one, it changes the sizes.
It looks like all the models have this feature.