Since the parallax effect on the iPhone 6S is more gimmick than use, we would like to explain to you here how you can disable this motion effect in iOS. For this purpose please proceed as follows:
Step 1: Open the Settings
Step 2: Tapped on General -> Accessibility -> Reduce Motion
Step 3: Pushes now the slider "reduce movement" with "Off" to "On" to disable the parallax effect in symbols and signs
The parallax effect will now no longer applied in symbols and instructions on the homescreen. You have successfully disabled this on the iPhone 6S.