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6.14. App display in Full-screen
ColorOS 5.0 device features a new display format with an aspect ratio of 19:9,
and most of the apps are supposed to adapt their size automatically to the new
screen size. If some apps are not suitable for full screen mode, they will display
at the 16:9 ratio by default, but you can let the phone to make changes in your
app to accommodate the new screen's size and rounded corners.
Adjust your app layouts. Go to [Settings] > [Display & Brightness] > [App
Display in Full-screen] and you will see a list of apps that doesn't support the
19:9 aspect ratio. Toggle the sliders to green if you want the apps to display in
full-screen. Or you can open an app, then click “Tap full-screen display.” App
will restart when you turn on this feature.