Donut Chart
The Donut Chart displays data of one series in a donut with each piece being the size of proportioned amount of the total amount:

Donut Chart
The Donut Chart expects data in a two column format such as:
Type | Value |
a | 37
|
b | 28
|
c | 42
|
d | 78 |
In the Graph Designer you can then select the column you want to use for your x-axis, which in this case is the different sections of the donut:

X-Axis Donut Chart
Hence, the x-axis column does not need to be the first column. However, for consistency purposes it is recommended to always use your first column for the x-axis.
The size of each donut piece will be automatically calculated and if you activate the tooltip, which you can do in the Graph Designer:

Activate Tooltip
You can see the exact percentage as well as the absolute amount for each donut piece:

Donut Chart Tooltip