Reading mail
When I open an email, it only show a small stri[p of the message to the right of the screen. I want the message to cover the entire screen.
iPad Pro 12.9-inch, 3rd Gen, Wi-Fi
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Perhaps you have managed to enable a Slide Over view - this being a major multitasking feature of iPadOS, fully detailed in the iPad User Guide for iPadOS.
To transform a Slide Over view, to Split Screen, use the grey drag-bar at the top of the Slide Over Window; drag downwards and to towards the side of the screen. As the view changes, lift your finger. Done.
It’s also worth noting that you can easily change a Slide Over to Full Screen view in a similar way. This time, using the same drag-bar, drag to the top-centre of the screen, then release.
You may find these overview Apple video guides to be helpful:
After viewing, you’ll be ready for the additional Multitasking Guide:
https://support.apple.com/en-us/HT207582
The iPad User Guide for iPadOS is also a rich source of information. Here are links to both the downloadable and online versions of the Guide:
https://help.apple.com/epub/ipad/en/
https://support.apple.com/guide/ipad/welcome/ipados
I hope this explanation and additional information is helpful in resolving any difficulties you may be having with Multitasking features of your iPad.