Change left outer join on SAP Universe Design Tools
The OUTER clause is optional, you'll find a good answer in this SO question:

LEFT JOIN vs. LEFT OUTER JOIN in SQL Server




CREATE TABLE T1 (id int, name varchar(10));
CREATE TABLE T2 (id int, name varchar(10));
INSERT INTO T1 VALUES (1, 'OneT1'),(2, 'TwoT1'),(3, 'ThreeT1');
INSERT INTO T2 VALUES (2, 'TwoT2'),(5, 'FiveT2'),(6, 'SixT2');

SELECT    *
FROM      T1
LEFT JOIN T2
ON        T1.id = T2.id;


SELECT     *
FROM       T1
LEFT OUTER JOIN T2
ON         T1.id = T2.id;
GO



id | name    |   id | name 
-: | :------ | ---: | :----
 1 | OneT1   | null | null 
 2 | TwoT1   |    2 | TwoT2
 3 | ThreeT1 | null | null 

id | name    |   id | name 
-: | :------ | ---: | :----
 1 | OneT1   | null | null 
 2 | TwoT1   |    2 | TwoT2
 3 | ThreeT1 | null | null 



dbfiddle here