There are a number of options that you can set within a Google Group, including advanced options which you can display if required.
From the Groups page, click on the name of the group you wish to change
Click on Group Settings on the left-hand side of the screen
Choose General to set the group name, description and welcome message, as well as who can see and join the group in the organisation. You can also choose to allow external colleagues to join the group, and choose who can view and post messages in the group.
Choose Member privacy to choose how member email addresses can be viewed
Choose Posting policies to choose who can moderate content and metadata, and whether all or new member posts need to be approved before they are posted into the group.
Choose Email options to set a subject prefix and email footer for all messages in the Inbox. You can also set the language of the group, and set auto reply options.
Choose Member moderation to choose who can manage members and to set up custom roles in the group.
If you enable advanced settings in the group, you will be able to set additional options such as:
Who can contact the group owner
Whether members will able to reply to group messages from their own email inbox
Whether users will be able to post to the group from the web
Who can reply privately to the author of a message
Who can attach files
The default sender of messages sent to the group - the author's email address or group address
Whether messages with the same subject are grouped into the same conversation thread, regardless of who they are from
To show advanced settings for the group, turn the Advanced option on, in the top-right corner of the screen.
After making all changes to the group settings, click on Save Changes along the bottom of the screen.