Found a solution: when you go into the full menue and hover above the individual parameters (wind, wind gusts, currents, etc.) you can click a little button to pin this parameter to the favorites. HOWEVER:
(1) only quite a limited number of favourites allowed before others start to disappear
(2) If you'd still like to switch to a parameter only available in the full menue, the route does disappear
(3) favourites are displayed in the order added, which makes no sense content-wise... I now have wind somewhere on the bottom of the list, wind gusts somewhere on the top...
Old format was just a lot clearer