Screen Lock

Hello vibrant community, I noticed something that whenever I'm turning off my computer and then turning it back on it's not asking for password and that's a really big concern if I am not at home and someone can access just by turning it on and messes with it. Is there a way to fix that?

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Do you have the automatic Login active? Please control it in the Settings. You can find it in the User Tab; it should be the 4th from the Bottom: