Mulling doors/sidelights turns them into windows

[CElder]

Searching for ideas on how to combat my mulled door units switching to windows as far as rough opening dimensions and casing overlap/reveal and size.  My default is set to treat the mulled unit as a door but every time I mull doors and sidelights together, I have to go in and change all those details manually so they act like doors instead of windows.  This is very frustrating, as I often mull and separate the units multiple times throughout the design.

 

Is there a setting that I'm missing?  Or does anyone have a work-around they care to share?