yea it’s terrible, I totally agree! But I don’t think there’s an easy and 0 risk way to change it, unfortunately π
Maybe I can suggest you to disable it, especially if you very often a particular OS and just a few times the other one.. in that case you could maybe consider giving the default choice to an OS and rebooting to the other one as needed directly by your primary chose OS..
Hope I was able to explain what I mean (sorry, I’m not english mother tongue π )