This version of Unity is unsupported.

ListView.reorderMode

public UIElements.ListViewReorderMode reorderMode;

Description

This property controls the drag and drop mode for the list view.

The default values if Simple. When this property is set to Animated, Unity adds drag handles in front of every item and the drag and drop manipulation will push items with an animation as the reordering happens. Multiple item reordering is only supported with the Simple drag mode.