These are the tabs labeled Page 1, Page 2, Page 3 located below the title bar.
Clicking a tab with the mouse switches the page.
Right-clicking displays the Page Menu, and double-clicking opens the Pages option settings.

Clicking an item button launches the registered program, and right-clicking displays the Item Menu.
If you right-click a button with no item assigned, the Empty Button Menu is displayed.
The number of buttons changes depending on the size of the CLaunch window.

Right-clicking the title bar or the task tray icon displays the Main Menu.