How to close a layer.

Antony and Tim, Thanks!

I'm fairly new using Storyline and creating online courses, so it helps to find out which techniques are best practice and which ones just depend on the content. 

In my case, I thought a user might want to return to the main screen sooner than another. I have a seekbar with narration and information on the layer that the user can spend time reviewing, and the layer will finish on it's own, or the user can advance the seekbar to the end. It makes sense that using a close button or not using one should depend on the design.