Asus AP1720-E2 - Manual (Page 114)

Chapter 5: BIOS setup 5-10
5.2.4 General help
On the right side of the menu screen is a brief description of the selected
item.
5.2.5 Sub-menu
An item with a sub-menu on any menu screen is distinguished by a solid
triangle before the item. To display the sub-menu, select the item and
press <Enter>.
5.2.6 Scroll bar
A scroll bar appears on the right side of a menu screen when there are
items that do not fit on the screen. Press Up/Down arrow keys or
PageUp/PageDown keys to display the other items on the screen.
5.2.7 Pop-up window
Select an item in the menu, then press <Enter> to display a pop-up
window with the configuration options for that item.