I'm not sure I understand what you mean by "the main sharing screen."
Your existing screen shot looks like a partial screen shot of the full System Preferences window and from what you say, you can use the "Show All" button to get back to the other Preferences.
The Sharing Preference will show the details of the sharing service you have selected on the left. If you leave it on "Internet Sharing", that's what you will see.
What happens if you select a different Service, like "File Sharing"?
If you are seeing something different, can you share a full System Preference screen shot?
ivan