From the documentation about Calendar Inheritance, it is not clear that you need to add the expanded:true property so that the child calendars are visible
https://www.bryntum.com/docs/gantt/guide/Gantt/basics/calendars
From the documentation about Calendar Inheritance, it is not clear that you need to add the expanded:true property so that the child calendars are visible
https://www.bryntum.com/docs/gantt/guide/Gantt/basics/calendars
That's a bug, should not be required. I've opened a ticket to fix this: https://github.com/bryntum/support/issues/5102