LG G PADF 8.0 PLUS User Manual page 35

The Basics
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A blue box appears around the selected window with a blue semi-
circle handle between the windows.
Drag the blue handle to change the window sizes (one larger and one
smaller).
4. Tap the blue handle to access the Dual window options.
Tap the Swap icon to switch (flip) the app positions.
Tap the View app list icon to redisplay the apps list so you can
change the app for the selected window.
Tap the Open full screen icon to open the selected app in full
screen. Drag the blue handle (up or down depending on the selected
window) to return to Dual window.
Tap the Close icon to close the selected window.