Finally got a chance to look at my sizing issue. Here's a screen shot of the "Hello world" Korge project running on the JVM and in the browser. I only added the yellow circle centered on the stage sized to the width; all other code is the same. *Might be worth mentioning that I have a 1440p monitor (Seems like the JS canvas gets a size pretty close to my monitor)

Can you put the code that adds the circle here?

I'm using version

1.13.2.3

And the code to generate the circle is:

stage.circle(stage.width / 2, color = Colors.YELLOW).anchor(0.5, 0.5).position(stage.width / 2, stage.height / 2)

instead of

stage.width

try to use

stage.virtualWidth

stage.width

before 1.13.3.0 was

stage.actualVirtualWidth

(that changes depending on the window size), changed after that version to avoid this kind of problems. https://github.com/korlibs/korge/commit/ad6173dc27801b2c103615710f44eb1269e0df5d#diff-c553c1062490fbfda39a291b5714f74eL33-R33