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GMS 2.3+ Correctly setting rooms


I'm making my first game, I have most of it done, but I'm still unsure about room size (in-game experience resolution).

I know most people uses camera for this purpose (YouTube tutorials), but I decided to have solid rooms so camera itself isn't required.

I set my room width and height equal to full hd/hd resolution size (equal to my laptop resolution).
I set in options to have full screen game, but the testing version is still windowed I'm not sure why (I assume it will apply once it's executable file).

Could you point out what I am doing wrong and how should I set my room correctly, please? I'm bad at this stuff, although I'm learning by watching videos, making tutorial games and reading manual (which could contain more examples and more detailed information). It's my dream to make functional game.
Thanks a lot!