Is it an option to increase the width of the chart? The width only, not the height. Setting a value of 200 should avoid clipping of the labels.
You can also remove the item label format. This way the labels will not be that wide and they shouldn't get clipped.
Another suggestion I can make is to use horizontal bar series instead. Since the space is limited - horizontal bars might be a better solution to start with.
All the best,
the Telerik team
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