One UI 5.1.1 Update
Multitasking
Better app previews on the Recents screen
The Recents screen now shows apps as they will appear after you open them. You can easily see if an app is opened in split screen, full screen, or as a pop-up.
Easily switch from pop-up view to split screen
Press and hold the handle at the top of the pop-up window, then drag the app to the side of the screen where you want it to be shown.
Restore pop-ups snapped to the edge of the screen
Drag an app in pop-up view to the edge of the screen to snap it to the edge and keep it out of the way. When you need it again, tap anywhere on the pop-up to bring it back to its previous location.
Flex mode
Use the Flex mode panel with more apps
More apps can now be used with the Flex mode panel. When the Flex mode panel is turned on, just fold your phone upright and tap the button that appears on the navigation bar.