Qwt right-side legend suddenly went horizontal

My plot legend (placed on the right-side) suddenly became horizontally aligned.

https://i.imgur.com/Bo7vkmD.png

My code:

Code:

---

// Legend
QwtLegend *legend = new QwtLegend();
legend->setDefaultItemMode( QwtLegendData::Checkable );
insertLegend( legend, QwtPlot::RightLegend );
connect (legend, &QwtLegend::checked, this, &XQwtPlot::slotShowItem);

---

Frankly, the only thing I'm aware of changing in the plotting part of my code was that I moved the location of my base plotting library (the code shown above and some more) and created a new .so file for these wrappers. So it makes no sense how this would cause the problem.

I'm wondering how to fix this and make the two check-buttons vertical again?

Have a look at the implementation of QwtPlot::insertLegend and how QwtLegend::setMaxColumns is used.

Uwe

Thanks Uwe.

Still not sure what caused the problem all of a sudden, but setting the max columns to 1 fixed the issue.

legend->setMaxColumns(1);