1. - Remove the from the main Query, add a Subquery, drag into the Subquery and filter it there. Make sure you select the colum you'll use for the Outer Join further in the main Query:
2. - Create the Outer Join in the main Query:
3. - Execute again without filtering the final Result Set:
You'll now have ALL ROWS FROM , and, only the Rows from that are matching with the the WHERE statement and the OUTER JOIN: