Yes the lock stops are adjustable, there's a measurement that I can't rememeber because they have to protect he swivel oil seal form over-extension as well as the tyres rubbing which is an MOT fail.
Loosent he locknut, adjust the bolt, tighten the locknut.. All visible from the front of the axle.
If you have the tracking done this will need checking BTW, the LH lockstop protects the RH wheel and vica-versa.