The Launch button provides access to the Applications menu and many of the items in the Actions menu. You can access almost all of the standard applications, commands, and configuration options from the Launch button.
You can add Launch buttons to your panels.
You can access the Launch button in the following ways:
From a panel with a Launch button.
Click Launch.
Use shortcut keys.
You can use shortcut keys to open Launch.
The default shortcut keys to open Launch are Ctrl + Esc. To change the shortcut keys that open Launch, use the Keyboard Shortcuts
preference tool.
You can add as many Launch buttons as you want to your panels. To add a Launch button to a panel, right-click on any vacant space on the panel. Choose Add to Panel -> Main Menu.