Help in GameMaker

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The ULTIMATE GameMaker Studio: 2 General Beginners Guide (Now with words!) (+ Basic Programming)

Ребятки, я тут решил GameMaker получше изучить. Как мне нормально расширить сцену, чтобы она не расширяла окно игры, и я мог потом на объект применить код, чтобы камера за ним следила?
@GameMakerCommunity . Fix your program.
Because i lost an entire part of the game and now it won't let me do anything
edit: ah i fixed it
Oh yeah, i'm here one more time with one more problem.
This time, i'm needing help with validating my code, like, i have all the coding stuff ready, it was working until now and it dosen't works anymore. I know this is bad explanation, but just shout me.