1. Click on the Inspector
button, then click on the Attributes
button.![]()
2. Click on Icon 256 x 256 to change to a 256 x 256 size.![]()
3. Click on Icon 1024 x 1024 to change to a 1024 x 1024 size.![]()
4. Enter 320 pt and 320 pt into the size fields to change to a custom icon size.![]()