This is the "quickslots always visible" option. It used to default to "off", not it defaults to "on". Should be a simple click in the UI options.The new interface has got me a bit befuddled.
Something whose name I do not know is constantly turned on and cluttering up my view of things. It's the field of quick actions that only used to appear if one of my bags was open.
If I knew what this thing was called I could probably figure out how to configure it. I don't mind having it up when I'm travelling in a dangerous area, but it's absurd to wander around Elrond's house staring at my combat options if I'm not an orc.