MultipleSortSettings

Specifies settings for sorting by multiple columns. see example.

Name	Type	Default	Description
allowUnsort?	boolean		Enables removing the column sorting.
initialDirection?	"desc" | "asc"		Sets the initial sort direction when sorting from the unsorted state.
mode?	"multiple"		Sets the sort mode of the Grid.
multiSortKey?	ModifierKey		Sets the modifier key for sorting by a second or more columns. By default, clicking a column adds it to the sort order ('none'). Selecting a key modifier with the click removes sorting from all other columns. If set to 'ctrl', 'shift', or 'alt', clicking a column removes sorting from all other columns. The specified key must be pressed to add the column to the sort order. The ctrl value matches the Command key on macOS see example.
showIndexes?	boolean		Shows sort-sequence indicators for sorting multiple columns.