Sometimes while playing on Mac, the game will become unresponsive after resizing the window size and players will get stuck on the main menu.
To fix this, right click on your game in your Steam library and go to Properties. In the General tab, scroll down to the Launch Options text box and put the following string:
-screen-width 1920 -screen-height 1080
Then, relaunch the game. This should fix the issue for you. If not, please reach out to us and we'll try to see what else we can do help!