When viewing a file, the display may be fixed at a certain column position so that any text to the left of the fixed column will always be visible (ie, it will not scroll off the screen). To do this, select the Fix Column option from the View menu. Select Set Fixed Column to specify the column position.
You may also just fix the line numbers by selecting the Fix Line Numbers option from the View menu.
Note: Unregistered versions cannot fix the display past column 6.