I will never understand the advantages of a closed kitchen – if at all, then please as an open-plan kitchen that is planned large enough to also accommodate a decent table. But otherwise? The argument "smell" doesn't hold – with controlled residential ventilation and good exhaust, that's not a problem; without these two features, I already have the smell throughout the house when cooking. A glass sliding door doesn't really help either. Whatever. You want it closed.
Unfortunately, the room stub you want to use for the kitchen is not suitable for that. If modern, then like the example pictures from Saralina. That would mean the room must become narrower. Is that still possible? The remarks about the windows are also valid and must be considered.
If the room remains as is, then the U-shape is probably the better layout, but that will then be very "90s style." But even then you can certainly create good kitchens; they weren’t all dumb and silly in the 90s.
But please first express yourself regarding this (before more detailed suggestions come in): is the room for the kitchen already final or can the ground floor still be redesigned? Are the positions and sizes of the windows already fixed? What about the connections? For example, is it irrevocably set where the water/drainage must be?
These would be helpful pieces of information.
And if the ground floor layout is not yet fixed, then please upload it with notes on what must remain (position of the front door, for example), what is important, etc.
At the moment, this is too little concrete information for me to be able to give tips.