Android P DP4 introduces new rotation toggle icon, gives it more prominent placement in gesture nav
Android P DP4 brings App Actions to the 2016 Pixels
Call volume gets its own slider in settings on Android P DP4
Bluetooth section and NFC toggle in Android P DP4 moved to 'Connection preferences' settings submenu
Android P adds automatic setting for 24-hour time format
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The recently-released Android P developer preview 4 is meant to be one of the last two release candidates—according to Google's initial released timeline—and in general that means polishing up existing features more than introducing a lot of new ones. Even so, a few new tweaks are present in this latest build, like a new slider for controlling call volume in Settings -> Sound.
Settings -> Sound in Android P DP3 (left), and DP4 (right). Note the new "Call volume" slider.
The new slider isn't exactly a game-changing feature, but it does mean you'll have easier access to changing call volume outside an ongoing conversation. And it makes a lot more sense to have it included together with the other volume controls in settings, rather than treating it as an entirely separate thing.