Different resolution on Retina MacBook Pro

I’m trying to start Monogame development on my MacBook Pro 13inch 2017 and I see weird problem. I’m using Monogame 3.6 DesktopGL project and my Retina display resolution is 2560x1600 pixels:

But when I set:
graphics.PreferredBackBufferWidth = 1440;
graphics.PreferredBackBufferHeight = 900;

Then window perfectly fills whole screen as you see on screenshot bellow:

And that is weird to me because if my screen resolution is 2560x1600 how can window with resolution 1440x900 fill whole screen?

apple uses a scaling feature for your screen. actually you are on a 1440 x 900 scaling. otherwise everything would look very small. you can change this in your settings for your macbook.so it would be correct that the app is filling your whole screen.

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Even with no scaling applied in settings, it still applies a scaling factor to the window size.

This makes me wonder how you would actually take advantage of all the pixels in your game on a Mac…