In case there are more columns inside the DataGrid, a horizontal scrollbar appears when a user swipes left. However, sometimes it' not clear there are more columns further on the left. For example, when you define a column's width with a big value or when the number of first 5 columns fit perfectly with a device's width totally by coincidence. In those cases, it'll be helpful to display horizontal scrollbar by default so the user knows there're more information on the left. (Very similar to a vertical scrollbar)