You can enable the full screen mode button when you edit your game on itch.
Viewing post in it happens again jam comments
This PC is from my company, I have security and monitoring tools installed. I can't even plug USB sticks. One person in my team got in trouble because they downloaded a cracked version of a tool that had malware. I'm not saying your game has malware, I just can't download .exe without them noticing it. And if I download and execute every .exe on every game jam I'd eventually be in trouble. Sorry.
Still, for game jams it's always better to make a web version, even if it is with disclaimers like "if you're experiencing lag download the .exe", you'd reach a wider audience than just with a windows .exe. If I manage to get a hold of another PC (maybe a friend of mine) I'll give it a try. Thanks anyway, all good!