Huawei P40 User Manual page 196

On the Accessibility > Magnification screen, touch Magnification, then enable it.
Zoom in or out by touching the screen three times in a row.
While zoomed in, spread two or more fingers to further zoom in, then pinch two or more
•
fingers together to zoom back out.
Drag the screen with two or more fingers to view other parts of the screen.
•
Enable Color Inversion
Color inversion allows you to invert the color of the text and the background. When Color
inversion is enabled, your phone will display text in white and the background in black.
On the Accessibility screen, enable Color inversion.
Use a Shortcut to Activate an Accessibility Feature
You can use Volume buttons to quickly activate an accessibility feature.
1
On the Accessibility screen, touch Accessibility shortcut.
2
Touch Select feature to select the feature you want to activate with the shortcut.
3
Enable Accessibility shortcut. You can now press and hold the Volume up and down
buttons simultaneously for 3 seconds to activate the feature.
Adjust the Touch and Hold Delay
Touch & hold delay allows you to adjust the time the screen takes to respond when you
touch and hold something.
On the Accessibility screen, touch Touch & hold delay, then select a delay option according
to your preferences.
One-Handed Mode
You can switch to a mini screen view so you can use your phone with one hand more easily.
Settings
192