Sub-Menus of Command Bar in Explorer

[malvinas2]

For sure not the most important thing, but why does the sub-menu of "Include in library" in the Command Bar appear 'flat', whereas the sub-menus of 'Organize' and 'Share with' have got a 3D-look?

[3am]

Some parts have shadows applied by default and others don't. I don't know why.

[malvinas2]

You are right: The classic visual style supplied in Windows 7 already shows this strange behaviour. And even the sub-menu of "Include in library" in the original theme of Windows 10 still shows a different appearance compared to the other sub-menus.
Topic can be closed.