The documentation seems to not be up-to-date anymore since the proposed heightSpec “Parent100Pct” to get a 100% height of parent calendar is not an option, at least not in @daypilot/daypilot-lite-react v5.3.1.
Using that spec is suggested here: https://doc.daypilot.org/calendar/100-pct-height/
The only admissible heightSpec values in the mentioned version are "BusinessHours" | "BusinessHoursNoScroll" | "Full"