After updateat iOS 11.1.2 pe iPad, I noticed that Dock disappears from Home Screen, can be made visible with a swipe (Drag) from up to down, started from the bottom of the screen. That is, the same movement that I would normally do to make it visible Dock Bar in an application open on the iPad.
Initially I thought it was a feature of the new iOS and that this "auto hide" can be disabled from Settings. Surprise! In "General" → "Multitasking & Dock"There is no option to prevent it automatic hiding a Dock in Home Screen.
From what I found out, this is not a feature of iOS 11, but a bug that appeared after the most recent one update of iOS. “Disable auto hide iPad's Dock in Home Screen".
Resolving the automatic disappearance a Dock from Home Screen, can be solved very simplu with a total shutdown of the iPad and reopening. Press and hold the " / sleep"Then"slide to power off". After restarting, Dock will appear in Home Screen and it will only be withdrawn when you are in an application.
In our case, the problem arose on a iPad Mini 4 cu iOS 11.1.2.