The main menu has the following submenus:

Opens a new file. This can also be accomplished via the command line or by dragging and dropping a file to open onto the application.

Shows a list of the last files that were opened.

Reloads the current file to revert to the original state.

Exports the file, currently as a USD file only.

Opens the Preferences window.

Opens the Licensing window

Deactivates the currently used license on this computer.

Deactivates and deletes the currently used license on this computer.

Shows the About window.

Shows a window that displays the licenses of all third party libraries used by Vai.

Surprisingly, this quits the application.