Hi, I figured it out. Sorry for the comment. If anyone runs into a similar problem, the solution is to go into Display Settings and set the Scale to 100% (Boot Camp increases it by default).
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Thank you for your feedback. I'm happy you figured it out :)
As I wrote it (clearly not optimal), by pressing F, it's supposed to switch between 720p (windowed mode) and 1080p and put the game in fullscreen if your windows resolution is in 1080p too.
I hope it worked smoothly after this incident.
I really need to spend more time on resolution settings for my next game...