How can I restrict access using groups for a new member on a Business plan?

Hi sammybloomberg, thanks for messaging the Community!

By default, when a new user is added to the 'Everyone at' group, however, you can remove that group from the user and choose Group 2 instead.

Depending on your sharing permissions, you might be able to share a link to the folder in question, which won't require that person to be a member of your team.

If you need any further assistance, please let me know!

Thank you Jay. I cannot remove the person from Group 1 as for some reason, I am not a adminstrator. Please advise.

As the default group is a company-managed group, then it wouldn't be possible for non-admins to remove users from the group. 

You'll need to get the admin to remove that user from the group. You can read up more about groups from this page.

This group was created automatically and includes invited members. How do I add myself as a admin of the group is it currently has no admin. 

Only the team admin can make other users an admin for security purposes. Is the team admin using a company email? 

If so, you could ask your IT team to temporarily reactivate that email to make you an admin.

I am admin of the account however not the team yet I cannot add myself as admin for a automatically generated team. This workflow is going around in circles and now I am completely confused. 

Simply, I don't want someone to have access to the default group. How do change the setting in order to remove a person from the default group. Note, They already have access to the other group so that not the problem I am trying to solve. 

Thanks for the info, I'd recommend contacting the support team directly for them to assist further on this matter.