You can prevent a step from looping the Timeline Editor, by adding a "Move To Step" action.

The timeline editor is also documented here.

1. Add a Move To Step Action to the Timeline Editor
   
2. This will add a keyframe, which you can drag to any preferred location.
   
   In this particular example, the Action on this keyrframe will be triggered after one second the step has opened.
3. To edit the properties, doubleclick the keyframe and inspect the "Timebar Properties".
   
4. Select a target step, usually the step after the current one.
   
   This particular example will move to Step 2 once the time hits this keyframe.