Hello @Paul
Welcome to the Atlassian community!
Are you using Jira Cloud of Jira Data Center? If you click on the question mark button near your avatar in the upper right corner of the Jira screen, and then click on About, what type of version information do you see?
What exactly are you looking for in a "sprint calendar"? Are you looking for a calendar that show just bars for sprints, based on the sprint start and end dates?
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