The voice panel expands to full screen. Click the expand icon in the panel's top-right and the input area grows, so a long script fits on one view — image, video and text panels already worked this way, and voice now matches.
Tablets and narrow windows: the prompt panel fits itself to the screen. It sizes to the available width and always stays fully in view — even when the node sits at the very left or right edge of your canvas, at any zoom level.
Nothing changes on a wide screen; it works exactly as it did.