Add a password to one or all of the sections of your notebook if you need to make it more secure.

 

On the Review tab, click.

Select "Password" from the menu.
To set a password, click.
Enter your password.
Retype the password and click in the Confirm Password field.
Select OK.
There are backup copies of the notebook that are not protected, the dialogue box informs you.

Pick a fallback choice.
Account Options

You have the option to lock all the sections now that a password has been established if you don't want anything to be seen.

(Optional) Press Lock All.
Float your cursor over the down arrow at the bottom of the window.
Then select Password Options.

When the OneNote Options dialogue box opens, some password settings are visible. As you can see, by default, a section is left unlocked for ten minutes after you finish working in it.

Change the password choices.
Select OK.
The Password Protection pane should be closed.

 

 

Discreetly move to another section.

Navigate to the secured area.
You can't see the notes because you're locked out.

On the notebook page, click.
After providing a password, click OK.
You can now edit the notes once more because the section has been unlocked.