How do you get 2 sub-categories?

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i have tired all the settings i can find, and can’t figure this out.

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There are only categories and sub-categories. There are no sub-sub categories.

On your home page you can click the little hamburger next to the new topic button and add a category. You can then choose a parent category for it.

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then how does this forum get 2 sub-categories for certain topics?

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现在有一个名为 max_category_nesting 的隐藏设置，可以在 rails 控制台中更改。Sub-sub-categories - #2 by jomaxro 提供了一些提示。

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