Y axis side by side with qwt multiaxes not superposed

[Sangfeust]

Hello,

I have not found how to show correctly the multi axes.

So I set 2 axis:
setAxesCount(QwtAxis::yLeft, 2);

I enable the axis
enableAxis(QwtAxisId(QwtAxis::yLeft, 0).id, true);
enableAxis(QwtAxisId(QwtAxis::yLeft, 1).id, true);

But when I show the plot the 2 axis are superposed, not side by side.

Can someone help me to understand why?

Thanks.