choosing 0.5x zoom should force the phone to use the ultrawide camera, since that’s the only camera on the phone capable of that zoom. my hypothesis is that when you start on the ultrawide camera to begin with, that should increase your chances of being able to focus on something closer than 15cm even when there are background elements that are further away. my hypothesis is that when you start with the main camera at 1x zoom, as long as you have background elements 15cm or further away in the focus box, the switch to the ultrawide camera for macro will never occur because the main camera physically can’t resolve the thing in the foreground and so assumes the thing it can focus on (in the background) is the intended subject. i can’t test the hypothesis though because i don’t have a 13 pro nearby to test the hypothesis.