You can change the privacy settings for joining the team folder.
Open a team folder.
Press _ member(s) on the top to open team management page.
Press Privacy from the settings.
There are total 3 options. You can set in private, open in public, or automatically approve people with certain email domain.
***What is “Join immediately” for privacy settings?
For a company or a group, there’s certain domain for an email address which they share together. For example, our domain is @teammobile.io. To be simple and quick, you can just add email domain and set “Join immediately” for your team folder’s privacy settings. By doing this, people with the same email domain will join the team folder immediately without any approval.