Hello SB Team! 
I've been trying out some of the new features in 5.1 and can't quite figure out how to get the shrink text to fit feature to work.  I've added a shape and added some long text to force it to overflow, when I check the Shrink Text box to True, nothing happens.  I've also checked the box to true before adding my text and it still overflows.  How can I make this work?

Hi Scott,
It only works when you Preview or Publish the lesson - you won't see any difference on the authoring stage.

This feature was designed mostly to work with text that was dynamically set via actions (where you can't see it ahead of time). The thought was, if you can see the static text on the page, you could adjust the size yourself (with greater control).

Hope that helps!

Ahhh!  Makes total sense!  
Thanks!  Really liking the new background options as and the back to top when turning to next page!