In Superkey, all of the matches are highlighted yellow, and the selected one is highlighted green with a line to it from the text field. You can keep typing to narrow down the match, or you can navigate matches using the arrow keys (and optionally, cycle through them with the semicolon key, which is what I use). There's a screenshot at https://superkey.app.

For the Canon Cat, I'm actually not sure as I've only watched videos of this functionality there.