On an iPad, you can work with multiple apps at the same time. And this has gotten easier with iPadOS 15.
You can open two different apps, or two windows from the same app, by splitting the screen into resizable views. For example, open Messages and Maps at the same time in Split View. Or open two Messages windows in Split View and manage two conversations at the same time.
To open a second app in Split View
° While using an app, tap the three dot icon at the top of the screen, then tap the left button in the multitasking icon at the top of the screen.
The app you’re using moves to the side to reveal your Home Screen and Dock.
° Find the second app you want to open on your Home Screen or in the Dock, then tap it.
The two apps appear in Split View.
To replace an app in Split View
When you have two apps open in Split View, you can replace one of them with a different app.
° At the top of the app you want to replace, swipe down from the three dots at the top of the app.
° The app you want to replace drops down, and the other app moves to the side to reveal your Home Screen and Dock.
° Find the replacement app on your Home Screen or in the Dock, then tap it.
The two apps appear side by side in Split View.
To turn Split View into Slide Over
When you have two apps or windows open in Split View, you can turn one of them into a Slide Over window—a smaller window that slides in front of the first.
Tap the three dot icon at the top of the window you want to turn into a Slide Over window, then tap the right button in the multitasking icon.
(This how-to is based on my experiences and info on Apple’s support pages.)
