There's also a new dock for adding lots of more apps to the bottom of your screen, similar to macOS, and a new app switcher for looking at all of your open apps, similar to Mission Control. (laptopmag.com)
So if you're experiencing trouble with an app, just tap the task switcher button on your phone or tablet, then long - press the app's icon in the «Recent Apps» view. (android.gadgethacks.com)
It's just easier to use the app switcher for multitasking. (theverge.com)