Return of Reckoning

it was right in front of me... Thank you so much!

Hello,

I've problably did something that makes the RMB move me like an RTS, or an old Baldur's gate game.
that's pretty cool, but terribly annoying, after some research, i was unable to find how remove this option.
Worst, it's now shared with all my characters.

thank you very much for your help.