The layers and zones in the Program Tree can be sorted according to columns. The triangle in the header of a column indicates that items are sorted by this column.
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To activate the sorting for a column, click its header.
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To change the sorting between ascending and descending order, click the header again.
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To deactivate the sorting via the column, click a third time.
If column sorting is not activated, you can change the order of elements manually using drag and drop.