Layer is hiding objects on base layer - even when I don't want to

Hello!

I started my first new project after updating Storyline and I noticed that there is something wrong with slide layers and slide layer properties. I want layer(s) not to hide objects on base layer. So I went to Slide Layer Properties and un-selected "Hide objects on base layer" from Visibility settings, see the screenshot below. Text continues after picture...

  

 After doing this, I went to Preview this slide and for some reason this layer is still hiding the base layer. What should I do? I haven't had this problem before when changing Slide Layer Visibility settings. Thanks for your help! :)