Building root configurable for a plugin
Answered
I'd like to create a root configuration node for my plugin. My plugin contains several configurations under the root node.
I'd like that my root configuration node will have the same look & feel as the Intellij configuration has. For example, the "Other Settings" has a short explanation ("Settings that are related to non-bundled...") and a structured table of contents.

How can I do this without implementing this style from scratch?
Thanks.
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Please see https://plugins.jetbrains.com/docs/intellij/settings.html documentation. In general, we highly recommend adding custom groups into existing root groups and not add custom root nodes.
Thanks for your answer.
I created a configuration group according the guide you provided, but I still can't see the expected table of contents:

Provide descriptionKey in your <groupConfigurable> registration pointing to HTML-formatted description.