Now, Apple has streamlined that process. In the left-aligned dock on the CarPlay screen users will now see three recently used apps, so it's always easy to just tap one and jump directly back into Music, Messages, Maps, or any of CarPlay's other apps. Prior to iOS 10.3, the CarPlay dock had just one app at a time in this area.
The slight UI tweak should make it easier for drivers to switch back-and-forth between navigation and entertainment apps while in CarPlay. iOS 10.3 includes a number of other updates on iPhone and iPad devices, including changes to the app launch animation, Find My AirPods, and the ability for developers to update their app icons at any time, without needing to include the artwork change in a full update on the App Store.