Hello Jason,
There's no property to make the marker labels not to wrap but you have several options:
For a Pie Chart I would recommend to set the legends in the Legend Box instead of marker labels to increase the chart's readability. If you want you can create a separate Legend Box with an specific Width and Height to prevent the text wrapping. You could also create short labels and use the keyleg property.
Another option would be to change the font of the label to a smaller one using setPointLabelFont(java.awt.Font value) When setting a font in Chart FX, you must create a new font object with the desired attributes and assign that object to the desired chart element every time you want to change the font.
I hope this helps,
Priscilla
