Sony ILCE-7C Help Manual page 85

Note
[Focus Area] is locked to [Wide] in the following situations:
[Intelligent Auto]
The focus area may not light up during continuous shooting or when the shutter button is pressed all the way down at once.
When the mode dial is set to
[Focus Area].
You cannot execute functions assigned to the control wheel or the C button while moving the focusing frame.
Related Topic
Tracking subject (Tracking function)
Touch Operation
Adjusting the focus area settings to the camera's orientation (horizontal/vertical) (Switch V/H AF Area)
Registering the current focus area (AF Area Registration) (still image)
(Movie) or (S&Q Motion) or during movie shooting, [Tracking] cannot be selected as the
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