As mentioned in another topic, PMPro should manage access restrictions to the various area of your site. Also, when looking at the features offered by its BP add-on (https://wordpress.org/plugins/pmpro-buddypress/), it seems that BP groups management is included.
To know precisely which features will be restricted from your BP groups, it’s best if you ask directly to the plugin authors.
They will be more informed and better suited to help you:
Thanks for your advice about PMPro. But this plugin isn’t working fine for me: once the plugin activated, guests can not access to sign in page, they are redirected to the homepage. That is a big issue.
I wanted to contact the support, but it’s reserved to the PMPro members and I’m not ready to buy a non working plugin.
Have you ideas toi help me?
You're trying to setup your theme but you're experiencing errors when importing the demo content? Or you've just followed the setup guide but your website doesn't look exactly like our demo? These are common issues for which you can find easy and quick fixes.