Hi Patrick,
Thanks for using Syncfusion products.
There is no support for filtering based on Display Member in normal filter bar. We suggest you to use DynamicFilter or ExcelFilter which has support for filtering by display members. Please make use of the below code to enable dynamic filter or excel filter.
Code Example
//to wire Dynamic FilterBar.
GridDynamicFilter dynamicFilter = new GridDynamicFilter();
dynamicFilter.WireGrid(this.gridGroupingControl1);
//To wire GridExcelFilter.
GridExcelFilter excelFilter = new GridExcelFilter();
excelFilter.WireGrid(this.gridGroupingControl1);
Sample Link
For more information about DynamicFilter, please refer to the below documentation link,
For more information about GridExcelFilter, please refer to the below documentation link,
Regards,
Amal Raj U.