how to configure number of app-icons panels? I just got a new Moto Z2 Play with Android 7.1.1

There's only two app-icons panels ( the panels that appear when you swipe the home screen left or right to view additional icons ).

On my Moto Z Play ( also Android 7.1.1 ) I have seven panels.

I've spent some time searching through settings and googling and can't determine how to configure the # of panels.
Unless Motorola have significantly changed the way the homescreen works from stock Android, it only creates as many panels as it needs to show the icons. To add a new panel, press-hold-and-drag an icon to where a new panel would be, then drop it on that new panel. Now you should have one more panel than you did before.