How to add a New Action when viewing a Custom Perspective in OmniFocus 3?

I have created a custom perspective in OmniFocus 3.11.2 for macOS. How do I add a New Action when viewing this perspective? Trying several approaches, I always just get an audible signal and nothing else happens. Strategies that produce this: - menu bar File -> New Action - the keystroke shortcut for File -> New Action - the Return key No combination of grouping or sorting has enabled me to add a New Action. Background: my custom perspective filter rules only show actions that are - Available - In an active project - Contained within a few projects or folders Thanks!