Three of the six do not bring up the page thumbnail nav aid when using the mouse cursor to drag the right side scroll button.
These three Page Display options are:
--| Fit to Width Scrolling
--| Enable Scrolling
--| Two Page Scrolling
Placing the desired Page Display icons on the Toolbar:
Acrobat 8 or 9 > Open the More Tools dialog, scroll down to view the choices for Page Display Toolbar. Tick the desired options. The selected items are placed on the toolbar..
Acrobat X > Right click on the Toolbar. Select Page Display. Tick the desired display option to place it on the Toolbar.n.b., View the choices provided by "Edit" as well. Other useful items (such as Find, Advanced Search, and Check Spelling) are available there.