Create submission plan for a 140m² single-family house - feedback, tips?

The room on the ground floor is supposed to serve that purpose as long as there are children in the house, meaning as long as a lot of space is needed in the wardrobe.

Uh, for what?

Think carefully about what room sizes per room are "normal", so to speak. For example, a bedroom for 2 people under 13m² is, in my opinion, always too small. If the office is supposed to become one such room at some point, it is therefore too small. Or is it already clear that later only one person will sleep downstairs? (A skeptic might think something bad about that...)

Both our living room door and our kitchen door open outward (into the hallway). Both doors are actually almost always open; it doesn't bother us that they open into the "traffic area hallway." In the hallway, we only stay briefly to put on jackets and shoes, and in the kitchen and living room, the open doors do not take up any space. The doors even hit each other when open... another design faux pas, but a clever person came up with door stoppers for that.

The kitchen - dining/table - living room form an L, and there is also a door between the dining/table area and the living room. The living room is on the short leg; if you open all doors, you can walk in a circle.

Thank you for your objection. I have now made the house on the plan a few centimeters longer and wider, the "office" now measures 3.36x3.26, so almost 11 m2. One side should still be at least 3.45 long, then there would also be space for a large wardrobe (that's how we currently have it). Unfortunately, I have no possibility to upload the new plan until Saturday.

Sorry, I don't want to offend you. But I'm afraid the whole thing is so underdeveloped that it's hardly worth discussing.

and made wider, the “office” now measures 3.36x3.26, so almost 11 m2.

Then furnish it with a double bed

Mattress = 200 cm, with bed frame at least 210 cm. 326 cm are available, and a wardrobe is supposed to go there .. I always calculate Pax with sliding doors = 66 cm.
210 + 66 = 276 cm .. leaves 50 cm aisle in front of the wardrobe minus plaster etc., since it's 326 cm raw dimension.

And, as I said, the small ground floor bathroom doesn't work anyway, so it really makes no sense to add 10 cm of wall space here or there, the concept needs to be changed.

Here is my current bedroom, I even made the bed specially
Width 347cm. Bed - passage - Ikea Pax.

I will solve the toilet problem by swapping the shower and the toilet.