In a ScrollRect and a vertical layout group, how do I set child alignment to the left ?

Hi all,

In Unity 5.3.2f1, I have a scrollRect with content in a vertical layout group. My problem is I can't align the content to the left, it is always centered horizontally.

1. A loooooong text

2. ....A short text

3. A loooooong text

My organization is as in the documentation :

1. ScrollRect : with a component scrollRect vertical

2. .ScrollRectMask : with a mask

3. ..PanelContent : with a vertical layout group

4. ...Content

5. ...Content

Vertical layout group child alignment does not change anything. So, where do I set child alignment to the left ? Thanks !