Dear IgorBala,
you have different options based on what library you have chosen during Knowage installation.
If you have chosen Charts.js library you can only see the percentage values on mouseover on chart tootlip, to enable it you have simply to check the feature 'Show percentage' under the Series configuration details of the serie.
If you have chosen Highcharts.JS library, instead, you can both see the percentage value permanently without the need to go over the pie and both on the tooltip. In order to activate the first option you have to check 'Show percentage' under the Series configuration details of the serie. To activate the percentage on tooltip you have to go in the advanced tab of the chart widget configuration and to check the showPercentageTooltip following this path: values -> serie -> 0 -> TOOLTIP -> showPercentageTooltip .
I hope you find this information useful, but if you were looking for something different, please answer again!
