FileMaker Pro basics > Opening and managing files > Setting the zoom level
Setting the zoom level
To set the zoom level, choose View menu > Zoom In or Zoom Out, or use keyboard shortcuts.
If you can’t zoom in or out, a script may have locked the zoom level. To restore the zoom feature, run a script that has the Set Zoom Level script step with the Lock option deselected.
If your device supports gestures, you can also pinch to zoom in or out.
Windows: You can zoom in to a maximum of 300% when Enlarge window contents to improve readability is selected in the General tab of the Preferences dialog box, or if your system is using a HiDPI display.
Related topics 
Window display keyboard shortcuts (macOS)
Window display keyboard shortcuts (Windows)