Image 1 shows the two floors of my villa with load-bearing walls in red and door openings marked. On the upper floor, the left space is divided into two rooms. I would like to remove the wall in between and, in connection with that, remove the wall section (dashed in image 2) between the two doors (about 10 cm) and have a wide opening without a door (image 3).
How can I know if the section between the doors is load-bearing and must remain? Unfortunately, there are no drawings left that show anything other than the floor plan.