I want to separate a big room into a working room and open kitchen space.
The problem in separating the space is to find proper door -- the problem is that it is very hard to get a door frame to a frame of window and balcony door:
The window-door frame is about 7-9cm and limited by the valve of water-based heater.
Consider also this option where finding door mechanisms would be even more important:
where you may want to use consistent style and mechanisms in both doors, not two separate door designs like the picture.
What are options to separate a space with limited frame space?