Extended tips provide a brief description of the function of a particular icon, text box or menu command when you rest your cursor on that item.
Choose - LibreOffice - General, and check Extended tips.
A check mark indicates that the extended tips are activated.
Press the shortcut keys Shift+F1 to activate extended tips once.
A question mark appears beside the mouse pointer. You can move this Help Mouse Pointer over all controls, icons and menu commands to obtain a description of the command. The Help Mouse Pointer is disabled the next time you click the mouse.