Since the remake last patch you can no longer hold the S button while dismounting a horse to avoid going into weapon drawn stance.
Perfect solution would be to add a toggle for this since the "drawing weapon everytime you get off your horse" has been universally disliked since it was added to the game. Second best would be to fix the S key hold so that we have that workaround again.
Its been almost 2 months now can this bug at least be acknowledged? Since the wiz remake was non-optional bugs resulting from it should have a high prio!