Thank you for the feedback.
I will then have the window sizes changed to 113 cm x 138.5 cm. The next common size seems to be 126 cm x 138.5 cm, but that is probably too square for us, and then I think it won’t look so good with the three squares in the upper part.
We will say goodbye to the lift-and-slide door. We would actually have to widen it by at least 1 meter since we also want the option to carry a sofa or table through there. Even now, the 2-meter version is about €500 more expensive than two standard patio doors with hinged sashes and mullion. In addition, there would then be a floor-to-ceiling window.
What should also be considered is the parallel sliding door mentioned below. The additional cost would be moderate compared to the standard patio door. I am only concerned about the "safety notice" with the disclaimer of liability. Is this really serious or just a manufacturer’s precaution because this scenario has occurred once in a thousand cases? At least initially, a terrace overhang is not realistic.

