Hi there, go to the "scene" view of your actors, not the "game" view. These tabs are at the top left of the GS browser. In there you'll see layers. Oraganise your actors into the correct layers (you can also create new ones) and place the ones you don't want to move in a separate layer and make sure "scrollable" is unticked... that way it will stay fixed to the screen. The layers feature is great, makes it really easy to keep track of actors and control how "deep" they are in the scene.
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Hope this helps!