You can remove the dock only on your
iPhone7 Plus running the latest iOS version 10.3.2 or 10.3.1.
Thanks to you-tuber iDeviceHelp, he
shows very clearly way to hide the dock on iPhone 7 Plus in iOS 10.3.2, 10.3.1
without need to jailbreak. 
Here’s how to hide dock on iPhone 7 Plus in iOS 10.3.2/10.3.1
Step 1: Disable the Rotation Lock if you have
enable it.
Step 2: Swipe right on the HomeScreen to
the Spotlight Search.
Step 3: Flip your phone to Landscape Mode
and press the Home Button.
Step 4: After you turn back to normal, you will
see no dock on your HomeScreen.
That’s it. It works even if your iPhone is lock.
When unlocking your device it hides the dock. So this is cool trick to hide dock in
iOS 10.3.2 on iPhone Plus that you must try.
Watch out the video demoed by iDeviceHelp to hide dock on iPhone 7 Plus.
Have you tried this trick? Let us know in the comments.