How to NOT display child forum node on homepage forum list, but DO display child forum node on parent forum?

[Elliottz]

Hi there,
The screenshots will help understand what I'm trying to do, which is this:

I do not want the child forums displayed on the homepage forum list (those circled in red on the first screenshot), but when a user clicks the parent forum, for example East Asia, I DO want the forums displayed (such as in the second screenshot.)

How can I make this happen?
How to NOT display child forum node on homepage forum list, but DO display child forum node on parent forum?

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