If you're doing chord symbols, you may eventually find that you wish you'd put them all closer to or further from the staff. If you highlight a stretch of music, including the notes, text, and barlines, and then right click the highlighted area (or press Alt-Enter), you'll find that the dialog box has a separate tab for "Expression placement". You can use this tab to make global changes to all of the text within the highlighted area: its position above the staff, its placement with respect to the notes, etc.