There are a few buttons for frequently used commands like back and undo on the Quick Access Toolbar. OneNote automatically saves everything, so you will not find a save button like in other applications. There is never a need to manually save anything!
Make the Quick Access Toolbar your own
Step1: To customise the quick access toolbar, click the button.
Some of the common commands you can add are shown in this list. However, if the one you require is not listed, you can click More Commands and look for it in the dialogue box.
Step2: Choose a command to include.