2D symbol of doors & window on the floor plan.

[Magda-Karolina]

Hi! 
I would like to adapt the graphic representation of the door & windows symbol on the floor plan. 

The goal is to change the line type of the line highlighted in red to a dashed line.

Unfortunately, in Model View Options, I can only change the settings for the curved line.

I assume that it's the matter of changing the script.

Thank you in advance for any help!