In Logic and in Cubase/Nuendo you may want to turn off the fader moter on ta UF1/UF8 to stop the fader from bouncing up and down when scrolling through a lot of channels in your session.
Logic has an MCU feature that allows you to disable the fader.
You action it by pressing and holding the Ctrl MCU modifier (pre-mapped to soft key bank 5, button 1) and pressing the FLIP button. Do the same again to turn it back on.
information source - https://support.apple.com/en-gb/guide/logicpro-css/welcome/mac
Cubase/Nuendo MCU allows it via the MOTORS function.
To disable the fader motors, press the MOTORS button.To re-enable the fader motors, press the MOTORS button again. The faders instantly move to reflect the current settings
UF8 Softkey bank 4, Key 1
UF1 Softkey bank 5, Key 3