Hi.
I added ability to show groups which grouped by category.
Just select appropriate type of grouping and displaying
Just assign categories to groups and set “Show Group” to “Group by Category: …”
Sorting of groups in this case uses category as well.
Categories is sorted by Title
The result will be like
Icons are from group definition.
You have to use size 16px*16px
You can see in my example it were cropped