Not sure what type of coach you have but on mine you remove the cap nut, pull off the arm and then reinstall it one or two splined teeth one way or the other depending on where you want the wiper to track. I adjusted both of mine so they would rotate further to the left (viewed from inside). The drawback is they now set higher on the windshield when they are at rest.
If yours are the same style with the cap nuts, make sure when you put them back on the nuts are tight. Failure to do so could result in the arm backing off and stripping the splines.
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Dave
US Army (Ret)
2020 Entegra Accolade 37TS
2019 Jeep Grand Cherokee Trailhawk (Toad)
FMCA - F432054
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