independent Triggerbox set x variable when overlap, how would I go about it?

Hello,
I have a trigger box at a certain location that when the player overlaps, I would like certain actors to became inactive through level blueprint,
Heres what I have so far;

Screenshot 01 - Actor Construction Script
Screenshot 02 - Actor Event Graph
Screenshot 03 - Level Blueprint (Please ignore the BP_Letter2 that was my mistake)