The View icon in the Bookmarks Pane can be used in both Power BI Desktop and in the Power BI service to navigate between visuals similar to a slideshow. When View mode is enabled, the following navigation bar appears at the bottom of the screen and the user can close other panes and/or launch full screen mode in the Power BI service to further support the presentation:

As per the preceding image, the number and order of Bookmarks, bookmark names, and navigation arrows are included in the View mode navigation. Bookmarks are ordered based on their position in the Bookmarks Pane from the top to the bottom. To revise the order, Bookmarks can be dragged and dropped to higher or lower positions in the Bookmarks Pane.