Floor plan design for a single-family house approximately 125 sqm, 2 full floors

We are not completely satisfied with the arrangement of the windows yet.

If you mean the facades (the floor plans are probably at a different stage), then place the windows on the upper floor south side centered instead of aligned with the outer edge above the lower ones. I find the other sides fine as they are.

and where is the laundry then hung up or do you throw everything in the dryer?

Sorry, the drafts are not getting any better. Why don't you have an architect or planner for your project?

If you mean the facades (the floor plans are probably at a different stage), then place the windows on the upper floor south side centered instead of aligned outside over the lower ones. I find the other sides okay as they are.

Yes, we had already thought about placing the windows in the middle. I will draw it in and adjust the floor plans.

and where will the laundry be hung then or do you throw everything in the dryer?

Yes, dryer or rack which can stand in the office, outside in good weather.

We are still not completely satisfied with the arrangement of the windows. Are there any suggestions regarding this?

The views do not conform to the floor plans!!!
In the bedroom as well as in the children's room, only a wide window on the south side, that is completely sufficient and offers much more space for furniture placement.
Wherever possible, leave a corner where a wardrobe can stand. This space-saving rule is nowhere applied. That’s why you run into a wardrobe everywhere.
Omitting the door in the kitchen would increase its space value by 300%.
In my opinion: if you plan yourself, you should be able to immediately see certain things or not even draw them at all. One should be able to apply the simplest planning rules.
Since a design is a process, such disasters eventually become apparent at the drawing board. If not, then hand the work over to someone else.
The ratio of square meters to furniture is off on the upper floor! You cannot draw dollhouse furniture everywhere and think you have endless space.
A 120 sqm house is fine, but 60 sqm on the ground floor is a challenge. Even without an office. Here, an office is still squeezed in, and in the end everything on the ground floor feels cramped. Spacious living is hard to find. An oversized bedroom does not balance this out, it is completely overbearing. The sqm distribution between ground and upper floors is not in balanced proportion. Something has to be removed downstairs.

Where does it say that?
A house doesn't work if too many rooms are squeezed into too few square meters. I see too few storage options for wardrobes and such in your original idea.
If I were you, I would untangle the knot in your head and look at and evaluate the house issue neutrally.

I got stuck here while rereading:
I have to say that your new designs always start with the same sofa. Starting anew means starting from scratch and not deleting two or three walls to then change something.
You should delete the hard drive and take a different approach. And once again: the office downstairs needs to be deleted.
In my opinion, this program is a deceitful program that suggests to laymen that everything drawn is suitable.