Add a "Freeze" toggle to Frames instead of just "Turn Off"

[Clark]

I would like to freeze a frame so my client can’t see it in the presentation mode.

Turning a frame off works for this, except that then you can’t see the frame at all on the work space, and it’s lost in a long list of layers.

A better option would be to “freeze” it, where it would still be visible on the workspace but dimmed to 50% and NOT visible in the presentation.

[Gleb]

As a workaround, you can group the frame. Groups are not shown in the presentation. When you need it again, simply ungroup.