There are two types of sort:
- When you group and click on the column header sorting is applied over the items inside the group. If you need to sort the groups, i.e group headers, you should click over the group item above grid header. When grouping is applied through the UI default sort order of the group is ascending. However if there is sort applied over other fields, their sort order will be preserved within the group.
- When there isn't grouping applied - sorting is applied over the whole set of data item.
Maybe this is where confusion comes from.
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