Today we going to see about Pie Chart
We are going to use this sample data for Pie Chart
Let's take Chart from Palette 
Choose the Pie Chart
Select the required Dataset
Give the required field for Pie Slice
Now provide the slice Percentage/Value
Adjust the Pie Graph as required.
Pie chart for the above sample data is generated
Lets remove the Label below 
Select the Pie Chart
Untick the Show Legend to remove the Slice Heading
Now It's has been removed.
If you want to give Heading to the Pie Chart, 
Give it in the Title Expression Field
If you want change the Title heading font, 
use Title Font.
If you want to change Colour, Position of Title Heading,
Use Title Color and Title Position respectively.
If you want to change the label of slice,
go to Chart Data
In Details Section,
We can give in Label Expression
Now I am going to give Country with count
 in brackets
Always Provide text in double quotes.
Country 
and Count in brackets
Now we will get the required output
