Ooops.
Sorry Kovidgoyal, it is documented and I did read it, but really could not understand the comment... I thought I had to edit via the metadata editor...That metadata bulk editor also has a recalculate button. I guess, now, that this button does NOT cover the whole db but only the current book if not "protected".
So the tag browser is where one can select book by author, series,etc. at one clik of the mouse. (this for me so I won't forget).
Go to the tag browser, right clik author, activate "manage authors" in the menu... Inside this box, in the bottom left corner clik "Recalculate all author sort values".. It takes a few seconds to flag all updated author sort... Yes author Alfred E Van Vogt become Van Vogt Alfred E... just like I expected.
Sorry to be a pain and thanks for this very (too) rich software .
