Heya

I use a simple macro to hide specific hotbars. I use 5 hotbars for battle and all the others for stuff e.g. mounts, pets, quick acess for menus ect.

/hotbar display (number of the hotbar)

If you write this in a macro and use it, then your hotbar will hide or shown.

I use

/hotbar display 6
/hotbar display 7
and so on in a single macro to hide this hotbars to reduce clutter in fight.

An option to hide it automatic at specific situations... uhm i don't think this exist.

I hope this helps a little.

~My