Submenus can appear on menus to provide additional, related commands. Such nested lists are displayed with the menu text followed by an arrow. JDeveloper supports as many levels of submenus as you want to build into your menu.
Organizing your menu structure with submenus can save vertical screen space. However, for optimal design purposes you probably want to use no more than two or three menu levels in your UI design.
When you move a menu off the menu bar into another menu, it becomes a submenu. Similarly, if you move a menu into an existing submenu, it forms another submenu under the submenu.
To create a submenu:
Alternatively, you can create a submenu by selecting the menu item and pressing Ctrl and the right arrow key.
About Menu Terminology
About Menu Components
About the Menu
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