Mirror mode for hardware prompters
A hardware teleprompter sits a sheet of glass in front of the lens, at an angle, and reflects a display that is usually laid flat below or above. That reflection reverses the text, so the display itself must show a mirrored script. Turn on Mirror in Prompterbox when you are feeding that display.
If you are reading straight off a laptop or a tablet with no glass, leave Mirror off. You should be able to read the stage the same way you would read a book. If the letters look backwards, you have Mirror on by mistake.