after executing a query in PLSQL Developer, right-click the top-left corner of the results grid and select the 'copy with header' option. then use the plug-in to format the results, aligning the headers with the columns contents
example:
. without the plug-in:
NAME SURNAME AGE COUNTRY
Benjamin Button 34 Indonesia
. with the plug-in:
NAME SURNAME AGE COUNTRY
Benjamin Button 34 Indonesia
. Build the project
. Copy the DLL into the plug-in directory of PLSQL Developer
exemple : C:\Program Files\PLSQL Developer 12\PlugIns