Master layer hides permanently
There's a slide master layout that applies a layer that all slides should have.
On slides that contain a named slide layer, the layer property is checked "Hide other slide layers" and it also hides the master slide layer.
This isn't so bad and is actually the desired effect.
But the master slide layer doesn't re-appear when the in-slide layer is hidden.
Is there a way to get the master slide layer to reveal itself once again?