Hi An_J!
Welcome to the board.
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This thread here suggests that this limit is imposed by your graphics hardware, not MonoGame.
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The issue with the window size is, that setting the backbuffer is not the same as setting the window-size.
The backbuffer is the maximum resolution you’ll be able to draw (think of it as a big texture) and that’s going to be displayed on the monitor. Obviously the restrictions of point 1 applies here as well, so you won’t be able to draw a higher resolution that 4096x4096 with your hardware.
Nevertheless you’ll be able to draw to a bigger window… Your image will be resized automatically.
Use your maximum backbuffer height and width (4096x4096), set GraphicsDeviceManager.HardwareModeSwitch to false and IsFullScreen to true. That will give you a borderless fullscreen window if I’m not mistaken.
Hope that helps and that I’m correct.