Your answer is the other thread has been helpful. After different tries, I found out that formatting of paragraph itself (here "Normal_Number) need to be adjusted... made some progress although not getting what I want.

Oddly, paragraph "Hanging" and list's "text indent at" are linked... if you change value of one, then value of the other is also changing.

I shall revert back tomorrow but will tell my boss that anyway, numbered list right-aligned to the dot is pretty ugly, numbers are aligned with headers and it makes the number float.

Thanks for your help. For sure I will give the template for the professionals to check and find a solution. Cheers