LG G5 - Add Folders to Home Screen

From a Home screen, touch and hold an app icon and drag it over to another app that you want in the same folder.
Drop the app onto the other app (a folder is created and opened).
Tap the folder then tap the folder name field.
Enter a name for the folder, select a color (optional) then tap OK.
Touch an empty part of the Home screen to exit the folder.