In the window parameters, what is the wall type? Your screenshot shows a solid wall, so it should be just 'studwall'. But, if you are using partial structure display, maybe you just have 'core only' on?
If you select the window with the default settings and place one in the same wall, do you still not see any casing?
There seem to be quite a few bugs in the windows/doors, but invisible casing isn't one that I've seen.
Karl
One of the forum moderators
AC 28 USA and earlier • macOS Sequoia 15.2, MacBook Pro M2 Max 12CPU/30GPU cores, 32GB