Render.get_window_width() vs. GUI width

Well, render.get_window_width() returns a value that doesn’t seem to match the GUI.

I have set the game project width to 414. The function returns width 1080 on device. Not sure about the actual width, is there a way to get the actual width of a GUI?

I thought this might be relevant, but can’t get it to work:

ps. I am actually using Orthographic camera.get_window_size(), which in turn uses render.get_window_width(). That shouldn’t matter, right?