Go to skin customization and set your main hand to left.
when you attach a lead to a passive mob it appears in your right hand instead.
MC-84051
Leads are always in the right hand
Resolved
Duplicate
0
Thank you for your report.
However, your ticket has been resolved as a duplicate.
This issue has been linked to the original bugreport: MC-84031. You can find or add further information on that report.
Please search before reporting any bugs, as it's likely that one exists already.