This command opens the Column Headers dialog box, where you can hide or display the SI Explorer's right pane column headers, or to change the order in which they appear.

 

Headers with checks beside them will display (click to add or remove a check). Use the box's up and down arrows to change the order of the headers (the up arrow will move a header further to the left in the Explorer, while the down arrow will move it further right). The headers available depend on what type of folder or subfolder is selected in the left pane.