Graphical 3D vector subtraction and addition visualizer, and the monitor scale problem

P5.js sketch representing graphical 3D vector subtraction and addition by rotating. around y-axis.

I am interested in learning about how far the video setting relates to the sketch canvas. (In my case I’ve set it to 125% on my W7 PC with 1920 * 1080 monitor, making items like windows, icons, etc, 125% bigger) The sketch has an 800*800 canvas size, and when played not fullscreen I have to set my browser zoom to 80% to visualize the buttons.
I appreciate any comments related to the issue. Thanks.

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