You can hide and show each infobar separately. Just right click anywhere inside the toolbar area (the area with the buttons just below the main menu) and the 'toolbar menu' will pop up.
Then click on one of the items (corresponding to the name of an infobar) inside the toolbar menu:
- Article title bar
Alternatively, you can also show/hide the infobars
* by using "Menu: View/Infobars"
* by using the options screen (first click "Menu: View/Options", then access the category: "Infobars").