there's a bent leader option for linear dims, under dims. You un-check that, but on my system, un-checking and hitting ok does NOTHING. re open to find that it has somehow re-checked its self..... if you need it it, present this behavior to your VAR and ask them for help....
please post solution here afterwards so we may benefit too!
have a drawing open and open the document settings - enter "bent" in the option search bar to see all of your options related to bent leaders