Allow the "Speak" button to be removed, like other buttons

As a user who does not use Voice, I would like to reclaim the bottom-bar space occupied by the disabled "Speak" buttons.

The bottom bar of the viewer has buttons which can be enabled and disabled by right-clicking the bar. Except the Speak button, which remains even when Voice is totally disabled, and can't be removed.

Please allow it to be removed. When voice is disabled, it is just wasting space.