sorry I misunderstood your request. The object I've posted is to show an opening symbol in elevation not in plan view.
It wouldn't be that hard to add a 2d swing symbol to an existing window object. Here's a wee tutorial sort of thing
Open the window object
select it in the 2d plan window and select Open Library Object command from the file menu
Create a new parameter called
shwswing
Open the 2d script window
Look at the top of the script window. If the first line says anything like
IF so and so THEN END then you want to paste the following on a new line under that line...
IF shwswing=1 THEN GOSUB 2000
Scroll to the very bottom of the script window and paste in the following....
2000:
LINE2 -a/2,0,-a/2,a
arc2 -a/2,0,a,0,90
RETURN
If you get an error saying there is already a GOSUB called 2000 then just modify the scripts above to use a higher/different number.
Best of luck
AC versions 3.41 to 25 (UKI Full 5005).
Using AC25 5005 UKI FULL
Mac OSX 10.15.7 (19G2021) Mac Pro-2013 32gbRam AMD FirePro D500 3072 MB graphics