Hey @ety42211!
For an overlap event to be triggered, both actors need to have the Generate Overlap Events property enabled.
However considering your objective:
Sounds like you wanna detect when the character hits another actor. If the capsule component cannot go through your selected classes, no overlap will occur even if both actors have it enabled. So if that’s the case, you might wanna use Event Hit or On Component Hit instead. Tho if you need to use the end overlap event for a specific reason, check out this post of mine 
Hope this helps!