Apple has added more animation effects in the new iOS 11 including the home screen wall paper zooming in and out when you return to that screen and also what Apple calls the  parallax effect of icons. It can leave you a little queasy in your stomach.

Luckily you can disable these effects by enabling the ‘Reduce Motion’ option that sits in Settings > General > Accessibility > Reduce Motion

The effect is reverted back to a less obtrusive fade!