This Admin Settings tab will allow the Admin on any account to both see their team's settings (in regards to plan limits) as well as mass control the way their team's email are logged into Salesforce.
If you select the checkbox next to 'Override all Salesforce sync settings for my team', you will see the option to either only allow logging via BCC or only via API
If you choose this API logging, all settings that are selected for Opportunities, Leads, Contacts will be set for the entire team once you hit 'Save Changes'
From here, you will also be able to mass-enable Opportunities and Task sync across the team
NOTE: Mass-enabling these settings will use a high number of API calls across your team's Salesforce settings