It just replaces it, I have gotten to LV 50 with the hotbars acting just fine, but as soon as I try Archanist my hotbar containing my mounts just gets replaced with seemingly no way to make that not happen. It used to be the system crossbar, but because I always use the start menu I replaced a lot of it with my mounts. Whenever I summon carbunkle, it just goes away though.

I have delved into menus, swapped hotbar 8 to hotbar 7, but if I ever enable my pet hotbar it will just make my utility bar evaporate. If I can't get a solution to this I'm going to have to play it without a pet bar, and I bet that would be a bad thing to do in dungeons, to not have a pet bar because it ends up being a huge inconvenience.