Question Help, Unity Constant Phiscal Size UI on Mac Desktop build is tiny!

Hey, I've got a constant physical size chat UI that works fine on mobile builds - all the UI elements are roughly the same size on different devices, if I hold up a ruler to each. Works great.

But on a Mac desktop app build the UI comes out tiny, like maybe half the size. I'm thinking it must have something to do with the Retina display on my Mac, somehow its like the resolution increased and the size is based on that, or something?

Is there some value in the Canvas Scaler component or player settings that needs to changed correct this problem?

(I'd rather not apply scaling to the UI itself, because i am setting the height of the chat window to fit the screen, and it works even at this increased resolution)