You can now disable the option to share maps with everyone in a team or domain account. Previously, all users of a domain or team account could share their maps with everyone in the account using the automatic “share with all” group. This can now be disabled.
To disable, open the account management page and select the “account privacy” section, then, select the “Disable share with all” button
Once disabled, select “Enable share with all” to reenable this function