There's one other place where you'll see Vista-era title bars in Windows 10: in the title bars of MDI subwindows, where the application itself (or, rather, the

There's one other place where you'll see Vista-era title bars in Windows 10: in the title bars of MDI subwindows, where the application itself (or, rather, the Windows theming engine) is responsible for drawing the title bar rather than the DWM. For whatever reason, that little bit of the theme was never updated (probably because most users will never see it; AFAIK the only program that ships with Windows that still uses that style of MDI window is MMC). My hunch is that something similar's happening here: when you bring a Windows Console window full-screen, it disables its window decorations and the DWM stops drawing them. Through some quirk of timing, it looks like the console window itself starts attempting to draw its decorations, and, when that happens, you'll see Vista-style decorations very briefly, because that's what the theme tells it to draw. (I suppose it's also possible that console windows always draw their title bars themselves underneath the DWM-provided decorations... they've always been a bit weird in Windows.)