Click the Edit | Delete All command or press CTRL+DELETE to delete all modules in the Network Manager except for the Viewer Window. This command is functionally equivalent to the File | New | Project command, except you are not prompted to save the existing visualization project to a .VOXB file when using this command.
The Delete All command should be used with caution since it cannot be undone and all modules in the Network Manager are removed.
Edit Menu Commands
Viewer Window Module
The Network Manager
Introduction to Modules