Hello,
I would like to know if it is possible to add a calendar selector on the toolbar that set default project calendar,
and how can one create a customised calendar with custom holidays on UI.
Thanks
Yes, you can set calendar
. It is just a field of https://bryntum.com/docs/gantt/#Gantt/model/ProjectModel so it can be assigned a new value the same way as any other Model fields.
It can be done but currently we have no ready UI for creating the custom calendars.