https://i.imgur.com/0jungN4.png
Then, clicking on the button "PLAY" opens a (fullscreen) loading screen (even if you set the option in CMO to make it appear in windowed mode):
https://i.imgur.com/5FTyTQu.jpg
And finally, the main game menu appears:
https://i.imgur.com/I9C7oq7.jpg
I suggest to get rid of the (fullscreen) loading screen and to integrate it into the launcher itself, making it a real launcher (with a progress bar). This way, the CMO window could be able to load in the background.
Here is a mockup GIF that I made:
