All Files Setting the Layer Opacity If you need specific layers to appear semi-transparent, you can quickly set a drawing layer's opacity parameter directly in the Timeline view. A drawing layer's opacity parameter will appear in the Timeline view when this drawing layer has thumbnails display enabled: How to set a drawing layer's opacity In the Timeline view, do one of the following: Left of the layer's name in the Layers list, click on the Show Thumbnails icon. Select the drawing layer and press T. Left of the Layers list header, click on the Show All Thumbnails icon. The Opacity parameter is displayed left of the drawing layer's thumbnail. Do one of the following: Double-click on the value of the Opacity parameter and type in its new value. Click and drag the value of the Opacity parameter to the left to reduce it, or to the right to increase it.