Hi @RManathungage94 ,
In the Behavior > ViewerFieldsMode property of the report you can select from the following settings:
MergeWithUsed (default): With this setting, on the Additional Sort and Filters tab of the report form, the user can select any of the following as the properties of filtering and sorting conditions: any data fields used in the text boxes, any data fields used in the sorting and filtering conditions of the report, and any data fields listed on the Viewer Fields tab of the Schema Builder.
OnlySpecified: With this setting, on the Additional Sort and Filters tab of the report form, the user can select only the data fields specified on the Viewer Fields tab of the Schema Builder.
Hope this helps!
Laura