Tuplet brackets display

I have the tuplet bracket set to “Show only when necessary” but I have the feeling that it still shows it when not needed as shown in the screenshot. Is there a way to not display a bracket when the tuplet is beamed? (so smaller than quarter notes)?

No, Dorico doesn’t consider that tuplet bracket unnecessary because it’s considered (by us, and by Dorico, at any rate) bad practice to hide the bracket when the tuplet doesn’t cover the whole primary beam: it’s insufficient that it covers the whole of a secondary beam group. If you want to hide the tuplet bracket in this scenario, you need to do so manually.