Backend -> Kunena -> Categories -> Category -> (tab) Category Name and Description -> (field) Topic Template
The topic template is used to display a stated text when a new topic will create. This text appear in the editor if a new topic will create in this category, and can be completed. BBCode can be used for these descriptions.
If you switch the category in the editor mode, you get a modal with the question, if this content should be replaced or keep.
See also the similar topic Category Description
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