On the right side, you see all the screens and slices in a list view. In the list view, you can fold and unfold screens. This doesn’t do anything to that screen in Resolume’s Advanced Output. Folding a screen just hides the slices in that screen in the Preview in Chaser. This is helpful if you need to focus on a specific part of your stage, or if for whatever reason, you do have overlapping slices and want to work with the set underneath. If you like, you can also fold the whole stage list itself for those hyperfocused chase creation sessions.
You can also toggle the visibility of an individual slice. Again, this doesn’t do anything to the slice in Resolume’s Advanced Output. It just hides in the Chaser Preview. It will draw itself with a stippled outline to remind you that it’s actually still there.