mail icon stuck in dock
iPad Pro / iOS 11.3.1
In an attempt to put app icons in alphabetical order, I selected General/Reset Home Screen Layout.
All the apps sorted themselves alphabetically.
However, I cannot move the mail.app icon from the dock. Pressed and held until the icon wiggled, moved it to the desktop and it jumped back to the dock. I can move the Airmail icon to the dock.
I turned the iPad off (no change); reset the iPad (no change). I hope to resolve this without having to engage the Reset button...
iPad