SQL Developer 24 removes spaces from column names when formatting query results as CSV. The issue does not affect manual export or the SQL command line utility, only “Script Output” window and spool files.
SET SQLFORMAT CSV
SELECT
CURRENT_DATE AS "Date today"
, 'Value' AS "Column Name"
FROM DUAL
;
Output (v24.3.1.347):
"Datetoday","ColumnName"
07-Oct-2025 15:02:52,"Value"
Output (v22.2.0.173):
"Date today","Column Name"
07-Oct-2025 15:04:26,"Value"