Header Line

The Header Line displays column headings when the panel is in detailed mode.

You can:

Click a column heading to sort panel items by that column. Click the same heading again to reverse the sort order. Only some columns can be sorted.
Drag the Header Line dividers that separate column headings to set the width of each column. Dragging is not available when a column is in Automatic Column Width mode; the width of the column fits the maximum width of the column entries.
Right-click a column heading, then click Automatic Column Width or Smart Column Mode (only on the Name column) to choose the mode for that column. See Configuration/Views for more information.