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Xfce 4.16 is Adopting Client Side Decoration by Default

But before you cry tears over the loss of traditional app menus I should stress that the plan is to go full CSD, not full GTK header. It’s a subtle sounding difference, but an important one.

Xfce 4.16 is switching to GTK header bars, but they’re more commonly referred to as client side decoration (CSD) as window borders are rendered client side (GTK), not by the window manager.