How to create a donut chart of Deals by Deal Type?
Visualization:

Steps:
Choose "Pipeline Deals" explore.
In the Field Picker section, choose the fields "Deal Type" and "Count" under "Deal" view.
Click on the Run button.
In the Visualization pane, choose pie chart as the viz type. Use "Legend" as value labels. Change the inner radius value to 40 as shown below to make it look like a donut chart.

Updated on: 25/04/2023
Thank you!