Not within the application.
A couple of places I've been to throw up a simple static web page with a list of the portals available so people can jump to them. Or if you want different urls, a page for each with an instant re-direct to the relevant portal.
...be more productive while being fun to use at the same time. For some, getting started can be a bit intimidating. This is especially true if Jira Service Desk is your first exposure to Atlassian...
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