This policy setting allows you to make the icons for the command buttons bigger (20x20 pixels). If you enable this setting, ...

This policy setting allows you to make the icons for the command buttons bigger (20x20 pixels).

If you enable this setting, the icons for the command buttons will be bigger (20x20 pixels), and cannot be made smaller (16x16 pixels).

If you disable this setting, the icons will be 16x16 pixels (the default),  and cannot be made bigger (20x20 pixels).

If you do not configure this setting, the icons will be 16x16 pixels, and the user has the option to make them bigger (20x20 pixels).