可以通过设置headerHeight属性来实现。它定义了列标题行的高度。默认值为25。在此基础上，要确保pinned列的高度大于等于headerHeight。接下来，您可以使用colDef属性中的pinned属性将列固定在左侧或右侧。如果您想让某个列具有固定的位置并在分组列之前出现，则必须将它固定在左侧或右侧，并使用sortIndex属性在它之后放置分组列。以下是示例代码：

var columnDefs = [
    {headerName: "Athlete", field: "athlete", width: 150, pinned: 'left'},
    {headerName: "Age", field: "age", width: 90},
    {headerName: "Country", field: "country", width: 120, rowGroup: true},
    {headerName: "Year", field: "year", width: 90},
    {headerName: "Date", field: "date", width: 110},
    {headerName: "Sport", field: "sport", width: 110, rowGroup: true},
    {headerName: "Gold", field: "gold", width: 100},
    {headerName: "Silver", field: "silver", width: 100},
    {headerName: "Bronze", field: "bronze", width: 100},
    {headerName: "Total", field: "total", width: 100}
];

var gridOptions = {
    columnDefs: columnDefs,
    rowSelection: 'multiple',
    pinnedColumnCount: 1,
    headerHeight: 40,
    sortingOrder: ['desc', 'asc'],
    sortIndex: 1,
    enableGroupEdit: true
};

在上面的示例中，Athlete列被固定在左侧并位于分组列之前。此外，sortIndex属性也被设置为1以放置分组列。