Accidentally enabled an autocomplete list which is slowing everything down

Question

I was typing too fast and accidentally pressed some key combo which enabled this monstrosity:

I still want local members to autocomplete as before, but this is overkill; it lists all available databases, tables, functions, etc. Disabling Intellisense doesn't do anything either. How do I turn this off?

Answer 1

Turns out this is actually a third party plugin called "ApexSQL" that came preinstalled on my machine. I disabled it from the top menu.