Labels in Donut chart

Hi! I am not really sure this is the best section of the forum to ask this question. However, I am working on a dashboard including a "donut chart". The visualization is fine except from the labels:

As you can see, not every slice is getting a label. It seems to me that it doesn't matter neither the size nor the position. I didn't fine any built-in option to make it show all the lables. I know that if the number of labels increases, the chart becomes messy, but 6 categories seems a bit too low...

Thank you for your support,

Marco