doors and windows cannot be differed in the floor plan

a door is shown in the floor plan with a circular arc, which shows the direction of opening.
that's OK.
Windows are also shown with arcs in the 2D floor plan, just like the doors.
But this is not "correct" in a floor plan. correctly, however, they they have to be displayed WITHOUT a circular arc, usually with an additional "center line" in the wall axis.
therefore:
(how) can I switch off this arc for windows?
or can I use another/my own floor plan symbol for windows?