我在哪里可以找到这个主题组件？

[Moin]

@Elena

但如何才能让“所有分类”不显示这个框模板

然后在你的站点设置中为分类页面选择不同的样式（admin -> 所有站点设置 -> 桌面分类页面样式）
你在这里启用了父分类的设置：

@Elena

@Elena

如何创建子分类

你创建一个新分类并选择一个父分类

Create a category in Discourse

This guide describes how to create a category in Discourse. Required user level: Administrator (or moderator if the moderators manage categories and groups setting is enabled) Categories are meant to hold a collection of topics that have similar subject matter. They include an abundance of configuration options you won’t find with the lighter-weight tagging feature. By default, category creation is limited to admin users. Moderators can be given the ability …