Sections in a board cannot be moved freely. Please allow a drag & drop movement of the sections inside a column and between different columns. It is crucial to be able to make my own ordering on a board.
Similarly, please do not automatically sort board groups alphabetically. Allow a custom ordering by drag and drop there as well. You already allow boards to be custom-ordered via drag and drop, so it should be easy to extend. Allow top-level boards without a group and board groups to be mixed in the ordering.