0👍
You could try using the bar width argument within the options section.
Example from: https://js.devexpress.com/Demos/WidgetsGallery/Demo/Charts/CustomBarWidth/AngularJS/Contrast/
scope.chartOptions = {
palette: "soft",
dataSource: dataSource,
//THIS COMMAND
barWidth: 0.5,
commonSeriesSettings: {
argumentField: "state",
type: "bar"
},
Source:stackexchange.com