I typically search the tutorials before the forums. Lots of people have written stuff on lists. Here's one that should help: https://www.scirra.com/tutorials/1417/r ... ays/page-1
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There's a built in function to check if something is still in the layout.
Add event -> Select enemy sprite -> Scroll to "Size & Position" (or search "outside layout") -> Select "Is outside layout"
Member since 16 Jul, 2013