Hi Rosemond,
The SfDataGrid supports both vertical and horizontal scrolling. Please ensure the following to scroll horizontally.
1. Ensure that there is scrollable content horizontally (i.e.,) More number of columns than that can fit on the screen.
2. Ensure that the SfDataGrid.ColumnSizer property is not set as ColumnSizer.Star.
Regards,
Vimal Prabhu