The Application button and Quick Bar are located at the upper left corner of the main Snappy Fax window.
The Quick Bar is always accessible because it is located on the window title bar, not a Ribbon tab that might not be the currently selected tab. If the main window is visible you can quickly make a selection from the Quick Bar.
When the Application Button is clicked a drop down menu is exposed. You can exit Snappy Fax from this drop down menu, there are several other options available.