For a demo site it is advised to following:
/** @var string Whether site is a production = 1 or demo site = 0 */
var $SITE = 0;
/** @var string Whether site has restricted functionality mostly used for demo sites: 0 is default */
var $RESTRICT = 1;
$SITE = 0
Allows multiple user logins with only one account. By default Joomla! allows only one active session per account as a security feature.
$RESTRICT = 1
Disables those logging in, both frontend and backend from changing user details - like password and username
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