Maximizing viewer / Restoring down
Maximizing
To maximize a viewer, do one of the following:
Double-click the image.
On the title bar of the viewer, click the down arrow 
, and then select Maximize 
.
Press [Ctrl+M] or [Cmd+M].
Restoring down
To restore the original size of the viewer, do one of the following:
Double-click the maximized image.
On the title bar of the viewer, click the down arrow , and then select Restore down 
.
Press [Esc] or [Ctrl+M] or [Cmd+M].