For a bubble report, clicking on Show/Remove related fields does not show/hide related fields in the Column drop-down .
Steps to Reproduce
Navigate to Reports > Create New.
For more information, see the product documentation topic Create a report.
Create a bubble report on the incident table.
On the Configure tab, click Show related fields.
Note that it does not show the related fields.
Use a chart type other than bubble with fields that can show related fields. Once that report is created, you can change to the bubble type, which will then display the related fields.
Related Problem: PRB1191013