R.I.P. Yuzu and Citra emulators.
Edit: I just read more about the development team behind those emulators, and Nintendo had a pretty strong case against them.
My unpopular opinion: The drawbacks of game cartridges (expensive, smaller capacity) aren't as bad as those of game CDs (less durable, cannot hold saves, load times).
Pokémon X/Y. Let's just say that I was ruined by Drayano's Pokémon ROM mods that I played prior to X and Y getting released. I have yet to also play any other unmodified Pokémon game released since then.
1: It's the "Zoom" option.
2: You are using the wrong key command to exit fullscreen. it's Alt-Enter. However, be careful when doing this, because it's also going to treat it like you just hit the Enter Key by itself.