Install the app on your phone
The app then opens from your home screen, full screen, like any other app.
iPhone
Use Safari.
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Tap the Share button, the square with the arrow, at the bottom of the screen.
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Scroll down and tap Add to Home Screen.
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If you see the switch Open as Web App, make sure that it is on. You can change the name.
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Tap Add, at the top right.
Android
Open the site in Chrome. Tap the menu with the three dots. Tap Install app, or Add to Home screen. Tap Install.