LG G Vista - Manual (Page 149)

147 Tools
To open a QSlide window
Open the Notifications panel (tap the QSlide icon , if necessary), then
tap the desired app from the QSlide apps bar.
OR
While using an app that supports QSlide, tap the QSlide icon .
OR
Using QSlide
The QSlide function opens the associated app in a window in the
foreground, allowing you to access other apps in the background. It will
display continuously on the screen until you close it.