Sony a7SIII Help Manual page 239

To cancel spot focus, touch
When [ Focus Mode] is set to [Manual Focus], the focus mode temporarily switches to [Continuous AF]. When
the touched area is in focus, the focus mode returns to manual focus.
Hint
In addition to the touch focus function, touch operations such as the following are also available.
The focusing frame for [Spot] and [Expand Spot] can be moved by dragging.
When shooting still images in the manual focusing mode, the focus magnifier can be used by double-tapping the monitor.
Note
The touch focus function is not available in the following situations:
When shooting still images in the manual focusing mode
When using the digital zoom
When using the LA-EA4 or LA-EA5
Related Topic
Touch Operation
Touch Panel/Pad
Selecting the focus area (Focus Area)
(Touch focus release) icon or press the center of the control wheel.
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