Whenever I type a word, Atom prompts me with a list of all matching words I’ve typed previously. How do I turn that off? I only want suggestions when I ask for them.
It sounds like you have the autocomplete-plus package or one of its plugins installed. By default, Atom doesn’t prompt with a list of matching words unless you press a key.
I did have that plugin. I disabled it, but that didn’t help. Uninstalling it did, though.