The Toolbars are the 7 icons to the left, and the 8 icons to the right, of the lower action bar. You can customize these very simply.

To do that you click the little ‘V‘ at the right of the 7 left side icons. When you hover over it with your mouse you will see  CustomizeToolbarSlotsToolbar

You can also access the menu by typing Ctrl+O, and then click UI Settings.