The show chart title option displays the chart title when exporting it to PDF for all charts except the multilevel pivot report.
1- Create a Multilevel pivot table with the following configuration:
Type: Multilevel pivot
Columns: Assigned to
Rows: Assignment group
2- Click on Style tab/Title and on Chart title option write a name for example: abc.
3- Save the report.
4- Export the report to PDF. Notice the chart title is not visible on the export only the report title.
After carefully considering the severity and frequency of the issue, and the cost and risk of attempting a fix, it has been decided to not address this issue in any current or near future releases. We do not make this decision lightly, and we apologise for any inconvenience.