I mean can I assign the DT switch for incremental adjustment to the rear steer with this ver SW?
I assigned CH3(where I will put my rear servo) to DT3 and DT4 w/ 30 increments but it does not show on the screen when I test it...
Sounds like you didn't program the DT switch correctly or you are programming a different DT switch. There is nothing in the programming that would effect that.