The Preview Panel contains a preview of the current Report. Any changes to Report Parameters, Report Dimensions Settings and Lists will be shown in the Preview Panel unsless the Auto-refresh preview option is not checked. After each edit action of ParametersSettings, Lists or Dimension settings the preview will be refreshed.
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Additionally, by using the Icons at the top right corner you may swich the device view: Desktop View, Tablet View and Mobile View. With this, the user can get visual preview of the report for different devices.
