Split screen email
How do I change the split screen email
iPad, iPadOS 15
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Presumably you refer the native Mail App sidebar? The Mail sidebar cannot be suppressed.
If instead you need help with iPadOS multitasking, information about using multi-tasking features can be found in this support page:
Use multitasking on your iPad - Apple Support
The iPad User Guide is also a rich source of information about using iPad and its many features. The Guide is available both online using a web browser (such as Safari), or as an Apple Books download: