Finally I found a workaround. There is a general cube shape in the inventory. You can change the dimensions of it so it can be used as small wall. It will behave as a furniture but it's fine.

Here it is:

Hi,

I would like to draw low interior walls that are 1,2m high. So they are should not connect to ceiling, they just seperate two rooms.
I was able to draw the walls, but ceiling is always connected to the top of the low walls.

Any idea?

Hubi