The zoom.setActive() method changes the current Scheduler zoom level. Zoom levels must be defined using the zoomLevels property.
This method can be called before init(). Available since 2019.2.3860.
DayPilot.Scheduler.zoom.setActive(index[, position])index (number|string) - zoom level index or named zoom level ID
position (string, optional) - reference position: "left", "middle", or "right"; if not specified, zoomPosition is used
Named zoom levels are supported since version 2020.2.4345.
dp.zoom.setActive(0);DayPilot.Scheduler.zoomPosition
Scheduler Zoom [doc.daypilot.org]