Texting with word match is driving me insane

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I have shut everything off in Settings->Input->Word Completion

The word complete is still on and it's terrble.

I'll type out the correct word and as soon as I hit space it substitutes what ity thinks is a better word (which many times it's not).

Then when I go back to edit it or delete a couple letters it's starts stuff stuffing in a another completed word. The whole message becomes uneditable.

I just want to shut it off and have it do nothing.

How can I do that? Registry Edit I assume.

Thanks