Modify automatic "Chapter one" headings text (chapters) to roman numerals

Scrivener Scrivener for Windows
1

I am new to Scrivener and don’t understand how the compiler works.
I use Scrivener 1.9.16.0 on a Windows computer

I started a project from an existing manuscript which I imported into the Fiction Novel template, and split the chapters into as many folders containing a single scene : the actual text. Folder and scene have the same, roman numeral title.

I want my epub output to have simple chapter headings providing the roman numeral of each chapter, with a period
My text is in French.
When I compile, I don’t understand what to do so that chapters are not automatically entitled “Chapter one” etc…, but rather “I.”, “II.”, … “XIV” and so on

Thanks for your help.