Draw multi group bar chart
There are several bar charts in the chart
Description
If you need to draw multiple columns in a horizontal bar chart coordinate, you need to click the "add a set of data" button
Two or more groups of data, this section will appear automatically on the interface
Adjust the column spacing, you can set the distance between two adjacent columns
When setting multiple groups of data, we must distinguish the relationship between "group" and "number of columns"
When stacked column diagram is enabled, column spacing is disabled
