I\'m running some queries in PL/SQL Developer, and one of the columns in the result has 18-digit numbers. Instead of displaying the entire number in the resulting grid, PL/S
SET sqlformat ansiconsole;
This will set the output format for any queries that you run hereafter. There are other sql formats but this is probably the best for your situation.
To revert to what you had earlier, use.
UNSET sqlformat;
*This has been verified on SQLDeveloper Version 18.3.0.277, Build 277.2354