Disable guest invitation for new conversations?

When creating a new conversation, you get the option to “Allows guests to join via link”, which allows anyone to join even if they are not registered members. Since our conversations can contain sensitive data, we would like to disable this option altogether, so that conversations are always restricted to members, no matter what. I checked the settings but couldn’t find an option for this, is this possible somehow? It needs to be disabled for both the web-App, as well as the Smartphone Apps.

Nextcloud version: 22.2.3

I think there is actually not the possibility to deactivate public conversations.

But you can search the issues or write an issue.