1. Sign in to the Google Admin Console.

2. Click Groups

3. Click View in Groups Service at the top right corner. You'll be taken to your Groups for Business service.

4. Select the group you want to show or hide.

5. Click in the top corner and select Group settings.

6. Choose Directory from the Information menu at the left.

7. Check or uncheck the box marked List this group in the directory to update its visibility.

8. Click Save.