I have password to sudo and when came back from suspend or logout, but when i open or start pc I login without password, how i make pc open with the password?

I don't use XFCE, but doing a search there seems there is no option to turn that on and off in a gui. I found this though: LightDM GTK Greeter Settings will save setting in /etc/lightdm/lightdm-gtk-greeter.conf and has no options for autologin true/false or on/off because the settings for that are …