To change Zoom Region between Full Screen Zoom and Windows Zoom in iPhone or iPad, there are two methods for your option.
Way 1: Change it in Zoom settings.
Step 1: Enter Settings > General > Accessibility > Zoom.
Step 2: Click Zoom Region to move on.
Step 3: Choose Full Screen Zoom or Window Zoom (i.e. the default) on the next screen.
Way 2: Change Zoom Region in the Zoom Menu.
Part 1: Enable Full Screen Zoom.
Triple-tap the screen with three fingers to open the Zoom Menu, and then select Full Screen Zoom.
Part 2: Enable Window Zoom.
Choose Windows Zoom in the Zoom Menu.
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