We can open another instance of Maya with the help of the command line, for this we will be using the Terminal.
You can open it with the help of spotlight or go into the others folder in the Launchpad.
Enter the following command in the Terminal.
open -n /Applications/Autodesk/maya2022/Maya.app/
open -n /Applications/Autodesk/maya2020/Maya.app/
open -n /Applications/Autodesk/maya2019/Maya.app/
open -n /Applications/Autodesk/maya2018/Maya.app/
open -n /Applications/Autodesk/maya2017/Maya.app/
open -n /Applications/Autodesk/maya2016/Maya.app/
open -n /Applications/Autodesk/maya2015/Maya.app/
open -n /Applications/Autodesk/maya2014/Maya.app/
open -n /Applications/Autodesk/maya2013/Maya.app/
open -n /Applications/Autodesk/maya2012/Maya.app/
open -n /Applications/Autodesk/maya2011/Maya.app/
If you have any question, leave a comment below.
I compiled a list of software and services that I use to improve my workflow, here is the link to the list.