Trigger box invisible?

I am working on a project where, when the character walks into a trigger box, the camera view changes to a different one.

The problem I have is that I can’t see the trigger box. I need to make it a specific size and usually when I dragged it into my projects it had the shape of a box but now it’s completely invisible.
Maybe I just did something very stupid but I can’t find a solution anywhere online.

You might have pressed G?

Have you also tried restarting the editor?