Calendar Selection lets you create an unlimited number of planning calendars and their:

renaming
copying
deletion
change of path
default selection (it will be selected as the current planning calendar during application startup)
visibility (The Active button activates/deactivates planning calendars to display/do not display them in the Calendar Selection on the Navigation Pane and in the event form under Copy to selected calendars.)
selection of the current planning calendar

Each planning calendar is stored in a MDB database file that can be shared by multiple users concurrently. Planning calendar may only be deleted if it contains no events and in the exclusive mode, or when accessing the calendar in a single mode only (if the calendar is shared by multiple users only by the user deleting the calendar). The MDB database file is deleted together with the calendar deletion.

The window may be closed by clicking the Cancel key, clicking the top right corner cross, or by the Alt-F4 key combination.