Adobe Photoshop CS6 User Manual page 567

Using global light gives the appearance of a common light source shining on the image.
Do one of the following:
Choose Layer > Layer Style > Global Light. In the Global Light dialog box, enter a value or drag the angle radius to set the angle and
altitude, and click OK.
In the Layer Style dialog box for Drop Shadow, Inner Shadow, or Bevel, select Use Global Light. For Angle, enter a value or drag the radius,
and click OK.
The global lighting applies to each layer effect that uses the global lighting angle.
Display or hide layer styles
When a layer has a style, an "fx" icon
Hide or show all layer styles in an image
Choose Layer > Layer Style > Hide All Effects or Show All Effects.
Expand or collapse layer styles in the Layers panel
Do one of the following:
Click the triangle next to the Add a Layer Style icon
Click the triangle to collapse the layer effects.
To expand or collapse all of the layer styles applied within a group, hold down Alt (Windows) or Option (Mac OS), and click the triangle or
inverted triangle for the group. The layer styles applied to all layers within the group expand or collapse correspondingly.
Copy layer styles
Copying and pasting styles is an easy way to apply the same effects to multiple layers.
Copy layer styles between layers
1. From the Layers panel, select the layer containing the style you want to copy.
2. Choose Layer > Layer Style > Copy Layer Style.
3. Select the destination layer from the panel, and choose Layer > Layer Style > Paste Layer Style.
The pasted layer style replaces the existing layer style on the destination layer or layers.
Copy layer styles between layers by dragging
Do one of the following:
In the Layers panel, Alt-drag (Windows) or Option-drag (Mac OS) a single layer effect from one layer to another to duplicate the layer effect,
or drag the Effects bar from one layer to another to duplicate the layer style.
Drag one or more layer effects from the Layers panel to the image to apply the resulting layer style to the highest layer in the Layers panel
that contains pixels at the drop point.
Scale a layer effect
A layer style may have been fine-tuned for a target resolution and features of a given size. Using Scale Effects allows you to scale the effects in
the layer style without scaling the object to which the layer style is applied.
1. Select the layer in the Layers panel.
2. Choose Layer > Layer Style > Scale Effects.
3. Enter a percentage or drag the slider.
4. Select Preview to preview the changes in the image.
5. Click OK.
Remove layer effects
You can remove an individual effect from a style applied to a layer, or remove the entire style from the layer.
Remove an effect from a style
appears to the right of the layer's name in the Layers panel.
to expand the list of layer effects applied to that layer.
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