Hide slice rectangles in 3D view

Support
6

I’ve run into this also, also when loading a scene from an earlier version of Slicer (5.6.1). To reproduce:

  1. In Slicer 5.6.1, load MRHead sample data
  2. Show one or more slice views in 3D
  3. Save to MRB
  4. Open MRB in Slicer 5.8.1
    Colored rectangles cannot be hidden. They resize appropriately with slices, but do not go away when slices are hidden.