A setting that enables control of Donut chart thickness is available under chart layout menu . If you use a “thinner” chart, the Donut will look more appealing and you will have space to add icons or KPIs values inside the Donut. Below is an example of thinner chart that has more space for icons, etc.
You can find this new setting under the Layout tab in the Donut panel, as shown below (the panel is only shown when the Donut chart is selected). Below you can see the setup panel.