Open ManytoMany left.jmp:

Open ManytoMany right.jmp:

Example data

Example data

Go to ManytoMany left.jmp → Tables → Join 

Select the Key variable in the left dataset and the Key variable in the right dataset

 and select Match under Match Columns.

JMP screenshot

Select the Include non-matches box in both the With Table column

 under Match Columns.

Example data

More information:

JMP: Join Data Tables

--- The End ---