How do i detect a collision end?

Hi, i making a puzzle so the pieces are dragables, and when the drop finish I set a flag in the object that this make a collision. but i need to detect when the objects leaves the place to change the flag for other value.

is not overlapping?

LittleStain is correct. If you're not sure how to do that, set "Is Overlapping" then right-click on the event to invert it (to "is not"). This event would check continuously, so you may want to also add "Trigger Once" from the system events.