The hideOnClick property (boolean) determines whether the bubble popup should be closed when you click inside it.
DayPilot.Bubble.hideOnClick
true
const bubble = new DayPilot.Bubble({ hideOnClick: false });
Activation [doc.daypilot.org]
DayPilot.Bubble.hideOnHover
DayPilot.Bubble.hideAfter
DayPilot.Bubble Class
Availability of this API item in DayPilot editions: