Sony A7RIII ILCE-7RM3A Operating Instructions Manual page 180

Help Guide
Interchangeable Lens Digital Camera
ILCE-7RM3A
α7RIII
AF/MF control
You can easily switch the focusing mode from auto to manual and vice versa while shooting without changing your
holding position.
MENU → (Camera Settings2) → [
1
Control Hold] or [AF/MF Ctrl Toggle].
Menu item details
AF/MF Control Hold :
Switches the focusing mode while the button is held down.
AF/MF Ctrl Toggle :
Switches the focusing mode until the button is pressed again.
Note
You cannot set the [AF/MF Control Hold] function to [Left Button], [Right Button] or [Down Button] of the control wheel.
Related Topic
Custom Key (still image/movie/playback)
Custom Key] or [
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Custom Key] → desired button → [AF/MF