Before continuing, in addition to checking the upper rear stepper motor grub screws (two per motor) on both sides as mkoistinen says I recommend you also check the belt tension using the phone app as shown at
https://help.prusa3d.com/article/adjusting-belt-tension-xl_401793. My right belt was so over-tight from the factory (4+ turns of the screw) that when I adjusted it
after the following steps, I ended up having to recalibrate all of my docks and tools because the tool changer would no longer pick up any of the tools and the offsets were no longer even in the ballpark. As a side note, if you don't have a decent quality low-profile 5.5mm offset wrench, you might want to get one. The multi-tool has a pretty loose tolerance on the 5.5mm notch and it quickly deforms, making it worse. You're likely to strip out both the wrench and the hex heads if you have to do the following steps repeatedly.