??? I know of the tweak that affects startup sorting
ID: sort_columns_at_startup
Provide a set of columns to be sorted on when calibre starts. The argument is None if saved sort history is to be used otherwise it is a list of column,order pairs. Column is the lookup/search name, found using the tooltip for the column Order is 0 for ascending, 1 for descending. For example, set it to [('authors',0),('title',0)] to sort by title within authors.
I found it (it is Not on the sort by on the context of the column header0
I think you can only drag if a tick is next to it.
Down below is the effective sort. clicking the arrowhead the changes the direction