Effective January 21, 2020, Tenable.io Vulnerability Management will be updating the way scan results are displayed in the UI. Scan results that are older than 90 days will no longer be viewable in the Tenable.io UI. However, customers will be able to export the older scan results in Nessus and CSV formats from the scan results History tab in the UI, or from the public API. Older scan results will be available for export until they expire at 15 months. For scan results that are younger than 90 days, there is no change to the way results are displayed. Customers can still view those results in Tenable.io, as well as export the results. This change is limited to results of individual scans older than 90 days and does not impact workbenches, dashboards, reports and other features of Tenable.io. 

For more information please review the documentation.