First of all, the yellow lines are comments, they are not used by GDevelop.
Second, the first line reads “the device is NOT a mobile device”.
Third, that line is not a parent event, so it won’t apply to lines below it.
Last, mobiles have no Left key, so you need to change that.
It looks like you don’t know the most basic things about GDevelop.
Some people took a lot of time to write documentation and tutorials so that beginners like you learn how to use GDevelop, and I find quite disrespectful to ignore all that work and come here for private tutoring.
I have already warned you about that and you chose to ignore me.
So I’m closing this topic for a week.
Feel free to come back to it after learning some of the basics.