Are the squares restricted height? Or pillars? Sorry if that has been explained.
If you have lovely cabinets, there is no reason why you cannot use all the available space for kitchen. You do not have to have a dining area devoid of cupboards. At 4 m wide, you can position a dining table down the door end. I would actually get rid of the door into the adjacent room (the one on the right) and open it up. That gives much greater flexbility regarding positioning of the table. What are the other two rooms showing on the plan?
Kitchens are lived in, working spaces. Dining spaces should be easily accessible and adjacent. They do not necessarily have to be right in the kitchen. They are not used as much as kitchens are. I woud look at the other space you have in the house and see if dinig can be moved elsewhere. We have a table at the end of our lounge now. It is a long lounge and the table is convivial, close to the kitchen (no wall) and has a lovely view of the garden. It works very well and is just a bit removed from the kitcehn so no unsightly washing up on view!
Removing the table from the kitchen, gives you a much more wow kitchen. If you can put the table handy, so much the better. We eat inforamally at the raised table in the kitchen. It seats 4. I would have had one that seats 6. It is not linear so it really does mean we talk to each other! Guests talk to me while I am cooking and they have having a drink. You have enough room to do this. Or the peninsular idea above. You need to utilise the length because you are a bit short on width for a decent island if you utilise the walls. If you can use the length and sit at the island or peninsular at the opposite door end, it might work better if you want to keep the room next door separate.
I do not think this space is easy to plan because of the doors at the end and I think a professional planner from a decent company would help you. But you must be flexible and open to suggestions. Do you have a separate laundry area? What must the kitchen have in it? How many sinks do you want? What about refridgeration/freezing, cooking appliances, coffee machine, dishwasher and food/crockery/gadget storage etc. ? I would rather have all of this tip top rather thana table in a relatively small space (due to circulation needed for doors).