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I’m building a custom extension in WYSIWYG Web Builder and currently all my properties appear in one long list under a single tab. I’d like to create multiple tabs in the properties window (similar to how official extensions have General, Advanced, Events, etc.) so I can group related settings more cleanly. How do I create extra tabs in the Extension Builder?

I’m sorry, but that isn’t possible.
Please note that the official extensions were not created with Extension Builder; they are C++ applications.

OK Thanks for the reply, one question then "Which PROPERTY type creates a drop-down list rather than a file selector?"

You can create a dropdown list with the 'options' property.