What are the steps to change or customize Windows 10 login pictures?

To change or customize Windows 10 login pictures, follow these steps:

1. Go to Settings by clicking on the Start menu and selecting the gear icon.
2. Click on Personalization and then select Lock screen.
3. Under Background, choose a picture from the dropdown menu or click on Browse to select your own image.
4. To customize the picture further, click on the Choose a fit dropdown menu to adjust how the image is displayed.
5. You can also enable the option to show a picture on the sign-in screen by toggling the setting under the Lock screen section.
6. Once you have made your changes, close the Settings window and your new login picture will be applied.