Targeting Circle

[Daimond]

can some one make or tell me how to make a targeting Circle. if you not sure what i mean, its the circle that rotaits around the mob tha tyou have targeted.

I have no problem with it before i got my first Mez spell. But now that i do have it i am finding it realy hard in a fight to see what mob i accualy have targeted, its way to small and blends in with the coloured circle alread around the mobs.