How do you make an enemy move by its own (without you controlling it)?

How do you make an enemy move by its own (without you controlling it)? I looked at the behaviors bundles and a can’t find how to make an enemy move by its own.

How do you want it to move?

I want it to move left and right

Is this what you mean?
https://youtu.be/RWfPv12VzQY