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Qwt uses Qt::mightBeRichText to determine if the axis title is rich text or not. Qt::mightBeRichText is a simple heuristic which checks whether there is something that looks like a tag before the first line break. See: https://doc.qt.io/qt-6/qt-sub-qtgui.html#mightBeRichText Fixed bug by using html br tag to have at least some html before breaking the line. Fixes #10209.