I think I saw a Dorico file where a minim (white note) is covering an 8th note, it is the same note, but there are 2 voices. So far in similar cases I get the notes to be one next the other. I’d like the “white note” to be “superimposed” on the 8th note, and thus have two stems.
set the voice column index of both voices in the properties panel to 1
I’m pretty sure there’s a global setting for this in Notation Options > Voices.
yes, there are actually several, also concerning different situations (like with dotted noteheads).