It's running in windowed mode by default. When it first launched it seemed to go to My settings are showing as 1280 x 800, windowed. There's no way to change it, since while I can pick other options, the confirm button isn't working.
The globalgameState doesn't have either of those options. As follows:
> {"$id":"1","_systemStates":[],"_lastSaved":"2020-02-17T05:47:48.9728264Z","_gameTime":{"$id":"2"},"_textBanks":[],"_userIdentifier":"cc02246a-4002-4e9b-bb39-875f03163c50"}
Here's what shows up on my main monitor when it launches (the splash screen for the company, I should note, displays just fine): 