MultipleSortSettings

Specifies settings for sorting by multiple columns. See example.

Name	Type	Default	Description
allowUnsort?	boolean		Enables the removal of the column sorting.
initialDirection?	"desc" | "asc"		Determines the initial (from the unsorted to the sorted state) sort direction. The available values for setting the initial sort direction.
mode?	"multiple"		The sort mode of the Grid.
multiSortKey?	ModifierKey		Specifies the modifier key for sorting by 2nd or more columns. By default, clicking a column adds it to the sort order (corresponds to 'none'). Selecting a key modifier along with the click will remove sorting from all other columns. If the key is set to 'ctrl', 'shift' or 'alt', clicking a column will remove sorting from all other columns. The specified key must be pressed to add the column to the sort order instead. The ctrl value corresponds to the Command key in a macOS environment. See example.
showIndexes?	boolean		Enables the sort-sequence indicators for sorting multiple columns.