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#11
It's not having a password that does it. Some of us like the convenience of not needing to log in, but I can see how it would be a problem for a family.
Windows tries to log in at start up as the last user who was logged in. If it finds that a password is needed it will stop at the log in screen to ask for one. If there's no password for that user it goes straight in.
One way to avoid this is to follow the instructions in Sign in User Account Automatically at Windows 10 Startup and in Option one, step 5 D...
...delete the user name and leave it blank. At start up you will then see...D) Enter the password of the selected local account...
Click OK and you'll go to the screen with the choice of users at the bottom left corner.