As Office user, I use to know the tabulation system of Word, and I can put marks on the ruler with mouse, and configure the mark to be left, right, centered or comma aligned.
I found the ruler in Mathematica UI, but I didnt succeed int using it. I searched on Google, but didnt find any help...
Could someone help to understand what is possible to do with it and how ?
Ok, the answer is : "use another mechanism". Table for example.