You can't change it without modding, there's no menu option. You can change the binds, dosn't fix the problem. Then it's even worse because you left click for left hand outside of menus and right click for left hand inside. I think it comes down to not being able to put a shield into the right hand. Which seems hard coded into the game.
StingingVelvet: I guess people dont understand complaining vs typing out problems and hoping some one on the forums has a solution for it. It worked on the Fav hot key thing, and people did try to point out a way around it though which is more helpful then some people on here.
Munching On: FF14 storyline, SAO PS4, Horizon.