This security setting determines the least number of characters that a password for a user account may contain. You can set a value of between 1 and 20 characters, or you can establish that no password is required by setting the number of characters to 0. Default: 7 on domain controllers. 0 on stand-alone servers.
By default, member computers follow the configuration of their domain controllers.
Windows Settings/
Security Settings/
Local Computer Policy -> Computer Configuration -> Windows Settings -> Security Settings -> Account Policies -> Password Policy
After changing group policy options, you need to update group policy. If you do not update group policy then settings will not effect. To update it just simply type below command and also sample image is shown.
gpupdate /force
In about command we used "/force" option, this will help up to update policy options forcefully.
