Changing resolution while in fullscreen

Godot Version

Godot 3.5

Question

When I am not in fullscreen mode I use OS.set_window_size(Vector2(800,600))
But I can’t change the resolution while I am in fullscreen.
Is there no way to change let’s say to 800x600 even if you are on a 1920x1080 monitor? (with black rectangles showing up on the sides)

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