This is the content displayed if the element is hidden.
There are two content types that can be rendered.
1. TextThe left toggle box can be used to select “Text” as the content type.
The text can then be filled within the Text Fallback section.
The right toggle box will be used to specify “template” rendering as the Fallback content. Once you have it enabled, you will then have an option to specify the template you wish to have rendered if an element is hidden.