Here is how to add border shadow on a pie chart page in looker studio
- First click on the file name from the reports list to open it
- Then click on "Edit" button in the top toolbar to enter edit mode
- Next click on "Manage pages" option in the page navigation toolbar
- Next click on the page name in the right sidebar
- Next click on the "Show properties" button above the pie chart
- Finally click on "Add border shadow" toggle on in the Pie chart properties sidebar panel









