There have been some discussions on this topic:
https://forums.steinberg.net/t/accidentals-in-multiple-voices/115755
https://forums.steinberg.net/t/fr-restate-accidental-when-seen-in-a-new-voice/133808/3
I’m still hoping for an option for condensed music and for multiple voices on one system. This is something I am still missing from Sibelius.