You probably know how and why you adjust Layer Opacity of a layer in Adobe Photoshop – so that the layer is transparent enough to have the pixels on the layer below show though. But sometimes you want to keep the Layer Styles you’ve applied, such as drop shadows, glows, or bevels, completely visible. This is where the Layer Fill option comes into play. The Layer Fill only affects the actual pixels on the layer, but leaves any Layer Styles you’ve applied to the layer intact. As you can see in the image above. The white box on the Shape layer has a few Layer Effects applied to it. I want those effects to be remain fully visible, but I want to hide the box. Using the Fill slider, I set the Fill opacity to 0%, which hides the white shape completely, but leaves the Layer Effects visible.