I am not entirely sure I got the question right, but here's my answer anyway:

You seem to missing the Filters Window. To open the filters click Ctrl-F. If the filter window is then not in a position where you want it move it around to a location. Unless you click Ctrl-F again, it should disappear...

An additional Tab "Filters" next to the All, Owned, Ordered and Wish List tabs cannot be created. It is however possible to save a filter (meaning the currently selected filter status is saved and can be easily recalled). To save it: Click on the little disc image next to the "Clear All Filters" button. To recall a saved filter: Click on the little folder image next to the "Clear All Filters" button and browse to the previously saved file(s).