If University security polices are applied to a Windows device, you might see "*Some of these settings are hidden or managed by your organization." in Windows Settings or face other restrictions. These are the steps to undo this for a personal device. This cannot be done for a computer that was set up by and is managed by the University.
If you have done this, save important files to somewhere not connected to any Microsoft, sign out, and sign back in to Windows with a personal Microsoft account.
This will not keep settings, configurations, and files that are only associated with your University account and only exist on your personal computer, so please make sure that any important data is saved somewhere else before beginning. This is not the case for files stored in OneDrive, which keeps a copy in the cloud.
Uninstall Microsoft 365 (the Office suite), as well as OneDrive and Skype For Business if they remain after removing Microsoft 365. These applications' licensing is usually what keeps the security policies in place.
Windows' account system may be remembering your University account.
Go to the Accounts page in Windows Settings (Start menu - gear icon - Accounts).
The Microsoft account connected to your University NetID may be remembering the personal device that had the security policies applied to it.
When you turn on your PC again, use a personal Microsoft account to sign in to Windows.
Students and many staff members at the University are granted Office 365 licenses. If you see an orange Install Office button in step 3.b. of the above instructions, you can click it to download a .exe package that will install the Microsoft software your account is licensed for.
During the installation process, you will be asked to sign in with a Microsoft account. You should use your University account here. After this, a screen with the heading Use this account everywhere on your device will be shown.
Leaving this box checked will result in the University's security policies being applied to your device again, and you will need to restart these instructions from the beginning.