1. Click on hamburger icon.

2. Click on dashboard panel and open funnel chart in edit mode.

3. The Edit menu box appears as you click on Funnel chart icon. And a widget gets added in content place automatically in dashboard.

4. In Formatting Property click on General Property.

5. Enter Following details in Color & Theme Property:
Theme: Material

6. Fill above details in edit box, As Shown in figure.

7. Click on Preview and Save and Exit.

8. Now, match your Funnel chart with the below example, it should look like the figure below: