Specifies the options of Toolbar display mode. Display option is considered when Toolbar content exceeds the available space.
Scrollable - All the elements are displayed in a single line with horizontal scrolling enabled.
Popup - Prioritized elements are displayed on the Toolbar and the rest of elements are moved to the popup.
MultiRow - Displays the overflow toolbar items as an in-line of a toolbar.
Extended - Hide the overflowing toolbar items in the next row. Show the overflowing toolbar items when you click the expand icons, if the popup content overflows the height of the page, the rest of the elements will be hidden.