LG LM-G910EMW, User Manual, Page: 795 / 804

LG Dual Screen (optional, sold separately) (LM-G905N) 194
Using Instant Capture on Dual Screen
When the phone is connected to the dual screen, the Instant Capture
function is enabled on the LG Keyboard.
You can use the keyboard on the main screen, capture the screen on the
dual screen, and insert it directly into the keyboard input window.
Tap on the LG Keyboard input screen.
• The screen on the dual screen is captured and automatically attached
to the keyboard input window.
Captured screen
Instant Capture
• You cannot extend the keyboard to both screens with this feature
enabled.