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You can configure the global search settings in Refined Configuration.

Confluence Cloud Knowledge base 

In JSD 4.12 Atlassian has introduced the possibility to use a Confluence Cloud knowledge base with a Jira Service Desk server installation. This is supported by Refined with a couple of technical limitations: knowledge base articles module and the search highlight module with custom settings don't work with a Confluence cloud knowledge base. The search highlight does work when default settings are selected. 

If your browser is preventing cross site tracking (this is the default option in Safari and Firefox) you might not be able to view the articles. This issue is present with Jira Service Desk too so it is not caused by Refined.

Further reading

Learn more in this tutorial: Let users browser Confluence from a JSM article popup

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