You may display the structure of a basic list in the Query Painter: This display contains the header line (page header), the line structure, and the footer line (page footer).
Header lines are subdivided into page headers and column headers. The checkbox Display Header is selected in the standard under List Line Output Options; this means that column headers will be displayed.
If you want to hide a line, deselect the checkbox for the entire line.
The system uses the short descriptions of fields stored in the ABAP Dictionary as column headers. If you want to change this text in a QuickView, do so by simply clicking on the column header you want to modify.
In queries, fields may only ever have one header.
Whenever you alter the output length of a field, the width of its header is changed as well.