^Responding to the above here 
Since connection fields will use the parent table’s display field, if you want to get data from other fields in the parent table, you will need to use a text formula, regular formula (sum, min, max. etc.), equation, or possibly a conditional rule/task.
Maybe this article can be of assistance to you:
How to Show Multiple Fields in Your Connection Dropdown
Also, @CarlHolmes 's reply in this thread may also be a solution you’re looking for: Connected record selection view - #4 by CarlHolmes
(Thanks Carl )