Thanks, yes it helps, but many manipulations anyway... If we could just say that walls are surrounding the room, it would be so easier... instead of being drawned by their middle...
But thanks, it works

Hi, i come back to this issue as i was not able to draw my walls with your advice. So i abandonned...
Now i try again for another drawing , just one room surrounded by walls of different size, one is 70cm wide, another 20cm wide, another 10cm wide etc...
If i want to draw a room whose size is 5mx4m ...

Hi, i try to draw my first walls.
I have 70cm wirdth walls, length 2006cm on one side and 1248cm on the other.
I draw the first wazll, 2006cm long, click, and go 90° to draw the other wall, but the drawing of the new wall is centered on the edge of the previous wall soi the length of the previous ...