Single-family house (10x8.8 sqm) on 437 sqm plot in Munich

Things like bay windows are unfortunately not included - they demand an incredibly high surcharge. Since we don't have that many square meters anyway, we won't reduce the basic dimensions of the house. We'll stay with a built-up area of exactly 9.96 m x 8.71 m. If the house can't extend further to the NE anyway and we choose an east entrance, wouldn't a large garage connected to the house make sense? But I think the front door would then be too close. Hmm.

It is of course also important that the windows are arranged symmetrically.

Otherwise a little dog dies on Mars?

How are the EG from post 41 and OG variants from supposed to fit together? The location of the stairs is different after all.

Do you need 1 or 2 parking spaces (not want)? I interpret your text excerpt to mean that in front of a garage (literally, therefore not in front of a parking space) there must be at least 5 m in any case and that these do not count as a 2nd parking space.

Which variant would you prefer and possibly change?

For a discussion, all stories should always be shown and preferably with a north arrow or "N" in the correct position. Also, it remains boring as long as you do not use correct wall thicknesses. If you already have a provider, check what kind of walls they have. For rough planning, however, you can initially use 40cm exterior walls and 20cm interior walls.
Furthermore, it is quite inelegant when the plot is dimensioned but corners are cut off or the entire plot is not shown. How important the corner is or not does not matter at first.

On the sketch, you can still see an old draft of the living room. The TV wall is too narrow for me, especially considering that it will get even tighter when the actual exterior walls are taken into account in terms of thickness, etc. What do you think?

I don't find the TV wall that bad at all. I think the width could work, depending on what you have planned.
What bothers me more is that the couch looks extremely close to the TV wall; that should be realistically drawn in. Estimated, it’s about 5m from the exterior wall to the TV wall, and you should maintain at least 4m distance, so there isn’t much space left behind the sofa. Likewise, the space from the outer side of the sofa to the dining table could be quite tight; can you still get through there?
Also, I find the passage between the stairs and the dining table to the kitchen quite borderline, that’s probably only about 3m? A fully occupied table can already take up 2.5m, so how will you get to the kitchen then?
Just for comparison: we have a living-dining-kitchen area in a row like you do, but we have almost 11m net space (and it’s just about enough!).
You have 3m less; I don’t know how that’s supposed to work.
Couch = 3m + table = 2m + kitchen = 3m = 8m and there are no passages in between anymore!

So, a bit more awake than this morning, now a little more input from me:

If you already have a provider, check what kind of walls they have.

The architect has planned our house on the plot in what apparently is the "best" way.

I didn’t really understand that either: the current status of the architect is being discussed, but a layman’s plan is shown (???). In the drawing in post #41, there is also talk of three "plots" and their respective floor area ratio utilization. What is probably meant are cadastral parcels, and it might be more sensible to first combine them into a single building plot.

The upper floor still gives us real problems, since I can’t get an optimal arrangement of the rooms.

I also have a mantra for this: "follow gravity," meaning develop the ground floor from the upper floor (because the latter is more complex). Laymen often think they’re struggling due to lack of experience/practice with this task—but in fact, it’s more about their approach, starting with the ground floor. And they start with specific room shapes/locations instead of with the "general" spatial program. Otherwise, they would quickly notice where the plan "glows brightest": namely where the quotient "wishes : square meters" is the spiciest. Hot spots are dressing rooms, showers, pantries, entrances and exits (the latter including terraces/garages/main and side entrances). If you then also keep in mind where downspouts most likely get their name from, it becomes clear why it’s unwise to “build up” floor plans from bottom to top when planning. The result is regularly rooms where all the furniture fits, but you can only walk through with your stomach pulled in, doors get pushed into corners, etc., and if you fix these mistakes and it finally "works" upstairs, it’s only at the cost of dormers necessary up to head height and/or downspouts boxed in next to the TV and dining table.