Whenever we can across the login screen, we have to select picture password option to switch from password and unfortunately this can't be changed. The reason behind this behavior is that picture password and PIN didn't work in Safe Mode. Thus there are some limitations in making picture password the default sign-in option.
You could refer to the following website to set up your picture password, then login system by this way.
How to create and use a picture password in Windows 10 | Digital Citizen
https://www.digitalcitizen.life/create-use-picture-password-windows-10/
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