Create new graphs with the new graph button. See version history and version notes in the main view of each graph.
Further Reading:
How To Videos - Protocol Editor: Welcome to the Editor
How To Videos - Protocol Editor: Accessing the New Menus
How To Videos - Protocol Editor: Version History and Releases
How To Videos - Protocol Editor: Branches
How To Videos - Protocol Editor: Nodes and Blocks
How To Videos - Protocol Editor: Introduction to logic and basic call flow
How To Videos - Protocol Editor: Flow Value Collectors