The rectangleSelectHandling property (string) enables the rectangle selection in the JavaScript Scheduler component and sets the default action. By default, the rectangle selection require Shift key to be pressed during selection (see also onGridMouseDown).
Available since 2020.2.4389.
"Disabled" - rectangle selection is disabled
"Enabled" - rectangle selection is enabled but no default action is specified
"EventSelect" - rectangle selection is enabled; all events under the rectangle are selected
"Disabled"dp.rectangleSelectHandling = "Enabled";