How does one adjust the equivalent of the barrel adjuster on the XTR RD-M9000 rear derailleur? I'm used to be able to turn the barrel adjuster on a rear derailleur to be able to bring the derailleur in or out (relative to the wheel). However, it doesn't seem like this particular derailleur works like that and I'm unable to find the equivalent.





The product docs didn't help too much either: https://bike.shimano.com/en-EU/product/component/xtr-m9000/RD-M9000-SGS.html
Page 19 of the linked Dealer Manual shows the barrel is in the shifter, up on the bars.  



From https://si.shimano.com/pdfs/dm/DM-RD0004-09-ENG.pdf

If yours doesn't have one, are you using a different/wrong or off-brand shifter?  You will need to fit an in-line barrel adjuster like this: