The self-explanatory actions contained in the toolbar are like those that we know from other text editing programs. They enable changing the font style, family, size, color, aligning and indenting text, creating lists and simple tables, and more. It is best to only offer actions that are relevant to your use-case in the toolbar.
On smaller screens, the custom toolbar imitates the overflow behavior of the SAP Fiori toolbar. If the available actions don’t fit into the toolbar, they move into the dropdown menu of the overflow button.