As we work to improve Jira Align, occasionally we find that there is functionality that is not commonly used and does not provide the intended amount of value. Additionally, there may be other areas in Jira Align that provide a more effective display of information.
For these reasons, starting in version 10.93, the Heat Map view will be removed as a card size option from the Kanban views of the Backlog. These changes will be released to test instances on April 24, 2021, and then to production instances on May 8, 2021. We will update this announcement if the estimated time of deployment changes. Relevant documentation will be updated when these changes are released to test instances.
Going forward, to view work items by each state, displayed as small squares, with additional information on those items, we recommend using the Work in Progress by State report.