Unclear how to make something into a vbox or hbox?

Plasmic Studio Questions
1

Is there a list of supported defaultStyles? Errors are useful for telling me certain properties aren’t supported, but there’s no context into how to set something to be a vbox or hbox

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2

We can set the element to be vbox/hbox using the type property but it’s mostly used when we provide defaultValues to element of type slot.