By default, the ScrollBySingleLine property is False. We recommended to set the ScrollBySingleLine property on True if you have one of the following:

• If you have at least a cell that has CellSingleLine property on false
• If the control displays items with different height. Use the ItemHeight property to specify the item's height.

Use the EnsureVisibleItem property to ensure that an item fits the control's client area. Use the ItemsAllowSizing property to specify whether all items are resizable or not. Use the ItemAllowSizing property to specify whether the user can resize the item at runtime