I Googled but did not find.
Upon installing Alteryx Designer 2023.1, I've discovered that the SQL Editor Test Query button is perpetually greyed out. It still works, but it looks like it's disabled.
See attached screenshot.
It doesn't matter what the database connection is, this is how it looks.
Not sure if that's a bug or an intended feature.
This is how mine is too - it's also how the Apps "Finish" button looks now. Fingers crossed it'll be fixed in the next release!