Is the plugin composer-default activated?
Rules or welcome topic
Is there a way to setup a topic or page for new users to make their onboarding smoother? This topic can have rules, basic how tos and anything you want the @Global-Moderators to tell new users.
You can create a topic and put everything you want there and then use
/admin/settings/notificationsand set the welcome notification link to the url of the topic. This will send a notification to new users that will take them to this topic.