The groups.expandAll() method expands all concurrent event groups in the row.
DayPilot.Row.groups.expandAll()This method has no parameters.
dp.rows.find("A").groups.expandAll();DayPilot.Row.groups.collapseAll()
DayPilot.Row.groups.collapsed()
DayPilot.Row.groups.expanded()
Concurrent Event Groups [doc.daypilot.org]