Do any of the following:

• To view a layer comp, you first need to apply it in the document. In the Layer Comp palette, click the Apply Layer Comp icon  next to a selected comp.

• To cycle through a view of all the layer comps, use the Previous  and Next  buttons at the bottom of the palette.

• To cycle through a view of selected comps, select the comps in the Layer Comps palette, and then click the Next and Previous buttons at the bottom of the palette. This cycles through only the comps you selected.

• To restore the document to its state before you chose a layer comp, click the Apply Layer Comp icon  next to Last Document State at the top of the Layer Comp palette.