Bug/Issue Co-Op Campaign Window is Blank

So, being hasty, I started Wargroove as always and, seeing the new shiny option 'Co-Op', I clicked it...

Too late I realized that I actually don't have the official DLC yet.

The game is now stuck on full-size background scene of King Percival and Mercia staring off into the sea. There's no option to go back, no menus to chose from, nothing. All I can do is forcibly quit the game via 'X' button in top left.

I'm on a PC, Steam version, without DLC. Wargroove version 2.0.2 build #19185