It's not anywhere you can get access to it, to change. So if you don't like it, generate the DDL yourself.
Thankfully, SQL Developer makes this easy with the 'DDL' command.
Simply do this in a SQL worksheet and run as a Script (F5)
ddl emp_details_view -- sub your view name, obviously
And the output, from our HR schema:
CREATE OR REPLACE FORCE EDITIONABLE VIEW "HR"."EMP_DETAILS_VIEW" ("EMPLOYEE_ID", "JOB_ID", "MANAGER_ID", "DEPARTMENT_ID", "LOCATION_ID", "COUNTRY_ID", "FIRST_NAME", "LAST_NAME", "SALARY", "COMMISSION_PCT", "DEPARTMENT_NAME", "JOB_TITLE", "CITY", "STATE_PROVINCE", "COUNTRY_NAME", "REGION_NAME") DEFAULT COLLATION "USING_NLS_COMP" AS
SELECT
e.employee_id,
e.job_id,
e.manager_id,
e.department_id,
d.location_id,
l.country_id,
e.first_name,
e.last_name,
e.salary,
e.commission_pct,
d.department_name,
j.job_title,
l.city,
l.state_province,
c.country_name,
r.region_name
FROM
employees e,
departments d,
jobs j,
locations l,
countries c,
regions r
WHERE e.department_id = d.department_id
AND d.location_id = l.location_id
AND l.country_id = c.country_id
AND c.region_id = r.region_id
AND j.job_id = e.job_id
WITH READ ONLY;
And if you want that in a file, just add this directly before the DDL
cd c:\path\to\file
spool view.sql
