Related docs is a great way to explore the content of your knowledge base, without a specific search query or question in mind.
If you hover over the doc of a document, you'll find the "Related docs" option.
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This menu shows you two different options; "this doc is mentioned in" and "similar docs":
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"This doc is mentioned in" contain a list of documents that contain a link to the document you are currently viewing. This lets you easily see how documents are connected with each other, update the links, or review all content that is linked together.
"Similar docs" shows you an overview of docs that have similar content to the document you are currently viewing. It's based on a semantic score, meaning that when we see overlap between the content of the doc, we'll shows them for you in this list. This is a great feature to use when you want to fully explore a particular topic within your knowledge base.
At this moment it is not possible to manually update or control the similar docs list.