In the Calendar, the mechanism is slightly different:
1. If you want to hide selected days (which are displayed as columns) you need to switch to ViewType="Resources" and generate the columns manually (skipping the hidden days).
See also:
https://doc.daypilot.org/calendar/resources-view/
2. You can also hide certain hours. They all need to be in a single block (i.e. 8pm - 9am) and it will apply to all columns.
2.a You can either HeightSpec="BusinessHoursNoScroll" which will hide hours defined using BusinessBeginsHour and BusinessEndsHour.
See also HideFreeCells property for reference: https://doc.daypilot.org/calendar/hidefreecells/
2.b You can set the visible hours using DayBeginsHour and DayEndsHour properties. This option will let you specify an overnight shift (i.e. DayBeginsHour > DayEndsHour).
See also:
https://doc.daypilot.org/calendar/overnight-scheduling/