Black Screen Privacy Filter On Keybind

I'm thinking there could be a feature where you can blacken the screen of Discord toggled with a customised keybind, or as an option to toggle in the tray icon. There could even be something that blackens Discord when being recorded, similar to how Netflix does with screenshares.

I think this could be useful for those who may go AFK from their computer and don't want people near their computer seeing DM's or server messages.