Hairpins do not change loudness mid-note.
The fact that hairpins do not change loudness mid-note makes sense for a couple of instruments for example the piano or plucked strings.
However, many Instruments CAN vary their loudness mid-note and they often do. Violin, Viola, Cello, Contrabass, Singers, and wind instruments for example.
Unfortunately, I couldn't manage to get this dynamic to work in Musescore.
I read this (https://musescore.org/en/handbook/hairpins) article and activated "Use single note dynamics" but this
still produces a quiet sound that doesn't get louder at all.