Disable Onenote Login
If you use OneNote 2013 to take notes that you want to keep private, securing individual notes is as simple as password-protecting sections. Oddly, you cannot password-protect entire notebooks, but securing individual sections — and thus the pages within — amounts to the same thing, except that
If you have selected the option, Microsoft OneNote application will run and OneNote application icon will appear in the system tray (or notification area of the taskbar). OR You can also use the following steps to start/stop running Microsoft OneNote application at Windows Startup.
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If you don't want to enter your password every time you sign in, you can create other sign-in options to use with your account, like a picture password or a PIN. If your PC has a fingerprint scanner, you can also sign in with a fingerprint. (Whichever sign-in option you choose, you still need a "regular" password in place to use a Microsoft
OneNote has no settings to control it starting automatically on login (unlike some other apps like Skype For Business). If it is starting automatically, then it has been added to some part of Windows that you need to remove it from like the STARTUP folder or a RUN reg entry.