I am also curious in this. I try some earlier method where apps/files_sharing/lib/Controller/ShareController.php was edited by changing
$folder->assign('showgridview', false);
to
$folder->assign('showgridview', true);
but there is no this line in mentioned file any more.
I would be so happy if I could know how to change default view to grid in general, not only for shared links, but I would also be satisfied if I could change it for shared at least.
Thx.