With the Mojave update a grey line appeared above every window, in either dark or light mode.

Grey line above the window on Mojave

Is it possible to remove that line? Any sort of hack of "hidden" setting? I've tried with:

defaults write -app [AppName] NSRequiresAquaSystemAppearance -bool No

But that needs to be set for every app, and just reduces it a little bit, it doesn't remove it.

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