Some meters have an OFF position (let's say flash exposure compensation, WB shift, bitrate, display gain), others don't (shutter speed, bulb exposure time, FPS, focus step size).
Same for discrete choices:
- some have OFF/A/B (Trap focus, Cartoon look)
- others OFF/A/B/C or OFF/A/B/C/D or more (REC/STBY notification)
- others just A/B but without the ON/OFF meaning (histogram scaling: linear/log; focus settings: left/right or up/down directions; defishing projection: rectilinear/panini)
- others have more choices, and can't be turned off (picture style, audio input source)
- edit: another type which was not addressed: Enable power saving: on standby, REC, or both. REC key actions: start, stop, or both.
I think it's important to show if a feature is active (highlighted somehow) or turned off (inactive).
I don't think that by setting picmode = standard you are "turning off" the picture style, or that by setting ISO auto you are "turning off" the ISO. But for bitrate, setting it at 1x means you are turning off ML bitrate modifications.