Using Late 2015 13" MacBook Pro as a 2nd monitor for Late 2015 27" iMac
Using Late 2015 13“ MacBook Pro as a 2nd monitor for Late 2015 27” iMac


You cannot use a MacBook as an external display for an iMac.


  Is there way to use the Sidecar and Airplay software to set up this?


No.