In any game with more than one layout, chances are you’re going to want a way to transition between the layouts. And you’ll want it to look reasonable. In this...
the condition for "Condition: Transition ▶︎ State = Out" doesnt appear for me, what should i do?
Without seeing the project, I don't know. Check that you've added all of the variables as suggested at the start of the tutorial.
Though it's worth noting that this tutorial is very old and hasn't been updated. You may be better looking at a different method using something like the Tween behavior, Construct 3 now has a new transition example file you can look at or asking in the forum.