The Context Menu for Worksheet Tabs.
The context menu for tabs provides the same functions as are provided in the Sheet menu item in the Edit menu. These options are explained at the bottom of Section 4.2.3 ― The Edit Menu. In addition, this context menu provides for two submenus to select any of the existing sheets, whether their tab is currently visible or not. The first submenu lists the sheets in their current order, the second submenu lists them alphabetically.