Hi @JZ,
Welcome in the Community !
In order to solve this problem, you can try to add in your "Group" column a "Value Order" property.
To do this, right-click in your "Group" column name, click on "Column Properties" and then "Value Order" :
Victor_G_0-1706039727106.png
You can then in the new window indicate the order of the categories :
Victor_G_2-1706039807668.png
And this ordering will be kept in the graph builder :
Victor_G_3-1706039861196.png
Hope this answer will help you,
Victor GUILLER
"It is not unusual for a well-designed experiment to analyze itself" (Box, Hunter and Hunter)