Whenever my laptop wakes up from sleep and shows the lock screen, I click and type in my PIN as normal. But on the lock screen at the top right, there's a Cortana box usually giving an example of what I can do, like 'tap and say remind me to water the plants when I get home'.

The problem is this box stays on the screen after the computer is unlocked, and displays semi-transparently in the top left over all other windows, with the only way to remove it is to double click, have a Cortana window display full screen and then close it.

I'd like to find a way of either fixing this or disabling Cortana from the lock screen altogether as I never use this feature. Any tips would be appreciated.