Zoom tool 
Use this tool to magnify or reduce the music as it’s displayed on the screen. You’re not actually enlarging or reducing the printed size of the music – only "zooming in" or "zooming out" while you’re working on it.
If the Zoom tool is selected, and you click (in Scroll View) or drag across the music (in Page View), PrintMusic enlarges the display, making it easier for you to do detail work. If you press COMMAND while clicking or dragging, however, PrintMusic makes the music smaller, letting you see more of the score on the screen.
Special mouse clicks
- Click the music or press COMMAND-+ to zoom in incrementally.
- OPTION-click the music or press COMMAND--(minus) to zoom out incrementally.
- In Page View, drag diagonally across a region of music to enlarge it just enough to fill your screen.
- While using any other tool, SHIFT+COMMAND–click the screen to zoom in, even though the Zoom tool isn’t selected. SHIFT+COMMAND+OPTION–click to zoom out.
See also:
Main tool palette