Office 365 Group editing is similar to editing a distribution list, although Microsoft has done some work to rearrange the tabs and make it a bit easier to access everything you need to:
You can edit an Office 365 Group with the PowerShell cmdlet Set-UnifiedGroup:
Set-UnifiedGroup -Identity "Business Management" -PrimarySmtpAddress bizmgmt@yourcompany.com -RequireSenderAuthenticationEnabled $false