Hello, this is Emily.
It is by design that Windows would like you to sign in everytime you turn on the computer. You can disable using the following:
Go to Settings > Accounts > Sign in options. Turn off "For improved security, only allow Windows Hello Sign in for Microsoft accounts on this device".
Once that's done, type netplwiz in the search on the taskbar and hit enter, then uncheck the box "user must enter a username and password to use this computer". Save the change and restart the computer. Then next time you sign in, it shouldn't ask for password.