Thank you very much for your contribution.
Yes, it is the architect's job, right. But in my opinion, even an architect cannot know everything, and it could also simply have been an oversight, misunderstanding, or other cause for a fundamentally wrong result, which is why I asked the person who does this every day, the window maker.
Actually, not even "our" window maker, but "a" window maker to whom we were sent by the architect, but initially only about the front door. Although I didn't really say that?
Because the gentleman seemed so nice and competent and also had a comprehensive exhibition of various windows, we immediately had him show us what all this was, what the differences are, etc.
And because the detail shown above was on the plan, the topic came up as well.
I have now chosen the easiest way for me (and in terms of the commissions, in my opinion, actually the right one):
I connected the architect and the window maker and communicated my wish list (see above) to both. The two have now discussed the matter with each other and it has turned out that there was a small misunderstanding in communication regarding the externally visible roller shutter box.
However, I can only report on the exact result once we have had another joint appointment.