Yes, you can add additional home screens. This process stumped me too when I got my V10 and I had to call on my LG expert........my son.
All you have to do is pinch on the home screen. Then all your main screens will be displayed, you can more, reorder and specify which screen should be displayed as the main screen when you unlock.
Just got my new Nokia 6, limited to only 3 homescreens... pinching the screen does nothing. But, I can view all three in one windows, but no option to create a new one.