If an appointment doesn't belong to any particular resource (the AppointmentItem.ResourceId property is set to the null), it is considered assigned to all resources. Enable the ShowOnlyResourceAppointments option to hide appointments that are not associated with any resource.
If the ResourceItem.Visible property of any resource is set to false, and the scheduler is grouped by resources or dates, all appointments that belong to this resource are hidden.
The following images demonstrate the Day View when appointments are grouped by a resource...
... and a date:
In the grouped Timeline View, resources are shown vertically on the left.
The Resource Navigator control is automatically displayed in the scheduler's bottom right corner when grouping is enabled. The control allows users to scroll through resources and change the number of resources shown on the screen at once.
The Resource Tree allows users to manage the resources. Users can drag groups and resources in the Resource Tree to rearrange them. Users can also check or uncheck checkboxes displayed next to each group and resource to show or hide them.