Sony a7C Mirrorless Camera (Black) - Manual (Page 513)

Help Guide
Interchangeable Lens Digital Camera
ILCE-7M3 α7III
MOVIE Button
Sets whether or not to activate the MOVIE (Movie) button.
Menu item details
Always:
Starts movie recording when you press the MOVIE button in any mode.
Movie Mode Only:
Starts movie recording when you press the MOVIE button only if the shooting mode is set to [Movie] or [S&Q Motion]
mode.
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MENU → (Camera Settings2) → [MOVIE Button] → desired setting. 1
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