I'm pretty sure this is a new change in 6.2 – when I get on a mount which has a special action, my hotbar automatically switches to the mount hotbar, so when I go to dismount, the button is not where I expect it to be, and I don't like its default placement on the mount hotbar.

I've had to stop using my white griffin because it's not worth the annoyance of the extra button presses.

Can I turn off this auto-switching somewhere in the menu?