Zoom-In and Zoom-Out Buttons
The following buttons in Composer's toolbar let you temporarily enlarge or shrink the size of the score notation viewed on the screen:
Zoom In makes everything look bigger, and Zoom Out makes everything look smaller.
It is important to understand that zooming in and out does not affect the size of what is printed. To change the size of what is printed, use the Font Size and Spacing command in the Format menu. For details, see Overall Font Size.