Shape Tool Mode 

These options allow you to use the Shape  Tools to create a Shape Layer , a new Work Path , or a rasterized Shape.  If you create a rasterized Shape you cannot go back and edit it after you’ve created it.

Blend Mode   
The Blend Mode s  that you can apply to individual Shapes are exactly the same as those that you can apply to a Layer .  Refer to the chapter on Layers  if you’d like further information.

Opacity
The Opacity  of Shapes can be changed by sliding the Opacity Slider in the Options  Bar.   It operates in exactly the same way as the Opacity Slider in the Layers  Palette.

Layer  Style  
Layer  Styles  are prepackaged effect settings that can be applied to a Shape .  You can either set a Style  from the outset by making a selection from the Layer Style Menu  in the Options  Bar or select a Shape Layer and select a Style from the Styles  Palette .  The one major drawback to using Styles is that every single Shape on a Shape Layer will adopt the style.  You cannot pick and choose which Shapes it is that you’d like to apply the style to if they co-exist on the same Layer .