Hi Maysa,
Could you please confirm us whether you need display an palettes item name with wrapping as highlighted in the below image. if yes, please refer to the below code example in which we have used paletteItem wrapping property to wrap the palettes item name. if we misunderstood your requirement, please provide us more details such as explain your requirement in detail with screenshot.
Code example:
BasicShape shape = new BasicShape();
shape.PaletteItem = new PaletteItem() { Wrapping = TextWrapping.Wrap };
Image:
Regards,
Shyam G