Thanks a lot for this, I was able to set it to fullscreen mode quite easily.
I also changed the resolution from the default 480x720, to 720x1080.
Reason I went with this resolution is because this is the maximum I could achieve on my monitor without the image looking stretched (my monitor is 1080p).
And yes the aspect ratio is 2:3 as you said.
I think for everyone else, just set the height to your monitor's native resolution height (height is the second number), for example, for 2560x1440 you set it to 1440. For the width, you have to calculate it in order to maintain a 2:3 aspect ratio.
I used this simple tool:
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Finally, all of this is running on Borderless Windowed, not true Fullscreen. This means that the actual monitor resolution doesnt change from the desktop res, just merely the window size and aspect ratio.
I did see an improvement when I raised the resolution however, so I dont know.
P.S. For Fullscreen, all you need to do is change it from 0 to 1. Read CarpenterB's post.