Split screen email
How do I change the split screen email
iPad, iPadOS 15
Question marked as
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: