If at times it is not possible to display all of the preview images or icons in the bar, then two arrows will be created automatically at each end. The normal arrows permit browsing by one image/icon forwards or backwards at a time. The arrows with a preceding line jump directly to the start or the end of the bar contents.
Note: Page changes are performed in the Top row as usual. The arrows only affect the display of the bar contents, not the current document page(s)!
