iPad Air 2.
The Dock Line ( with preferred and recently used icons often disappear in horizontal position. When I turn the iPad vertical (one or the other way round) it is again present, but has now moved to the right or lift side of the screen. If I turn the iPad to the other horizontal position I can find it but now positioned in the middle of the screen.
I know it should be possible or hide the Dock and get it back. For me it is not possible. The only solution for me is to close the iPad completely and then restart it.
I hope somebody can. help me.