How do I Create Barriers in 8-Direction mode?

I'm having a bit of trouble here... This is my first time using the 8-direction behavior.

On certain layouts, I want the player to stick to the path, so I'd like to create some invisible barriers that the player cannot cross. I tried adding events where the player stops on collision with or overlaps the barrier, but then the player never moves again. If this were a platformer, I'd just toss in a couple of invisible solid objects and be done with it, but I'm having trouble with this.

Any suggestions?

What's stopping you from using the invisible solid object method?

I feel like an idiot! That worked perfectly.

I thought I had read somewhere that Solid Object was only a function for Platformer mode. Thanks so much, I was totally overthinking this.

You're welcome. I'm glad you got it figured out.