FollowCamera active in Camera Trigger Box

Isn’t there an easier way to deactivate the box or the camera? For example : using the same input that activates the “third camera” and deactivates the camera or the box at the same time.
I’m a beginner, I understand what can be activated inside and deactivated outside a box, but not on overlay… (I probably misspoke too)

Here’s what I currently have in-game: (redbox for third camera activation) :

Thank you for your time.