Can't figure out how to set manual autocomplete

I'm sorry if this question seems too obvious, but I can't figure out how to disable autocomplete, so that it only replaces the text I'm writing by the prediction when I press the completion key.

I want to be able to press the "Enter" key and just write a newline, without my code being modified by the autocompletion, or accept the prediction with Ctrl+Space or some shortcut like that. Is there any way to configure that?