When you enable the auto-hide feature of the Properties palette, the software hides all but its title bar when you move your pointing device away from it. This gives you greater visibility over your design at times when you are not working with the palette.
To enable the auto-hide feature, click 
(Auto-hide) on the title bar of the Properties palette. In this mode, you can display the palette again by hovering your pointing device over the title bar.
To disable the auto-hide feature, click 
(Auto-hide) again.