How is this facade constructed?

If the windowsill is to continue, you will have no choice but to make the part where the panels are attached thinner than at the windows. Specifically, this can be done by using thinner wall thicknesses in this area or a thinner insulation.

Working with thinner insulation (but of higher quality or the same insulation value) behind the panels is probably also the solution in the example image. Nevertheless, the windowsill actually cannot simply continue from the frame over the masonry, as the windowsill itself would then form a thermal bridge directly to the masonry. I therefore wonder whether the windowsill under the panels was shortened in depth so that the thinner insulation fits behind it.

Um, what I don’t quite understand: Why don’t you use the website where you got the photo from? Three (!) minutes of research and the data of the window manufacturer (who is probably also responsible for the covers) are found. Since it is forbidden here under penalty of death to post links, I have to urge you to take initiative.

Uh, what I don't quite understand: Why don't you use the website where you got the photo from? Three (!) minutes of research and the data of the window manufacturer (who is probably also responsible for the panels) are found. Since it is forbidden here under the death penalty to post links, I have to call for self-initiative.

I already researched the company that manufactured the windows for this house and will contact them. However, our windows are built by someone else. Therefore, I don't know how much information I can get about the construction without having a contract with the company...