The style of the line numbers is specified in
Tools > Options > Text Editor > Micro Focus COBOL > Line Numbering, or using the buttons
Toggle COBOL line numbering mode
and
Toggle Standard line numbering mode
on the COBOL toolbar.
To remove the COBOL line numbers from source code:
This removes any numbers and text that are in the area for the selected line numbering style.
For example, if you have configured the editor to use COBOL line numbering, unnumbering removes all text from the COBOL sequence area.
You can use Undo to revert the changes.