RectangleMirrorScreen sharing from an ultrawide monitor
A 49-inch 32:9 display is 5120 pixels wide. Shared whole, it reaches your audience as a thin strip. Here is the setup that fixes it.
What goes wrong
Meeting apps scale a shared screen to fit the viewer's window, which is usually close to 16:9. A 32:9 desktop keeps its width and loses half its height, so text ends up far smaller than you see it. People ask you to zoom in, and they can also see your mail and chat.
The setup
- Arrange the screen in thirds. With RectangleMirror, drag a window to the left or right edge and it snaps to that third; drop it on the top edge for the middle.
- Put what you present in one third, for example slides on the left. Keep speaker notes in the middle and chat on the right.
- Switch on Mirroring and choose that third under Mirror Region. On a known ultrawide the three thirds are listed for you.
- In the meeting, share the RectangleMirror window. A third of a 5120 × 1440 screen is about 1707 × 1440, close to the shape of the viewer's window, so it fills it at a readable size.
Switching what you show
Press ⌃⌥⌘. to move the share to the next third, or drag a different window into the shared third. Neither interrupts the share.
Free for 14 days, then from $0.99 a month. macOS 14 or later.