3. Thanks for the attachment. Some users may find it desirable to have the same alignment in header title cells and header filter cells. Anyway there is an option to override the default behavior by adding inline style to column.filter.style.
{ title: "Order Date", minWidth: "190", dataIndx: "OrderDate", dataType: "date",
filter: { crules: [{ condition: "between" }], style: 'text-align:left;' },
halign: 'center'
},