Change the line number format in OPIM

Hello everyone,

I work on a project with different standards (3).
For example, in my catalogs, pipe of 2''1 / 2 were input like this:
76.0, 76.1 and 76.2
in the "Standard Preferences" dialog box, the 3 diameters are visible as input.
In the isometric diameters appears 2.5 and not 76.0 or 76.1 or 76.2
How to change that.

Best regards