In the new app versions released this week, I've renamed the default layouts that are created when you start a new account or install on a new device. This will hopefully make it easier to understand what the layouts are for and which one you want to use:
Song Only -> Big Lyrics
List Only -> Big Set List
Split View -> Split View
Practice -> More Controls
Dashboard -> Song Info
This won't automatically affect your existing layouts. But if you like the new names better, or want to be consistent with what new users will see, you can switch to the new names by clicking Help > Utilities > Rename Default Layouts.