2. Touch and hold anywhere on the screen.
3. Drag your finger to move around the screen.
4. Lift your finger to stop magnification.
Note:
You can't use zoom function on the keyboard or navigation bar.
Color inversion
Go to Settings > System settings > Accessibility > Vison and
enable "Color inversion" to invert the display colors.
High contrast text
Go to Settings > System settings > Accessibility > Vison > High
contrast text. Enable this function to increase the contrast with
background.