Trying to apply Gaussian blur to a layer group. I select the group. Go to the Effects Studio. Switch on the Gaussian Blur effect — but no contextual controls appear at the bottom of the screen. Tried Outline and 3D features, but, again, no contextual controls appear. Only effect that appears to work is the opacity slider at the top of the studio. What am I doing wrong? Thanks for any help you may be able to provide.