Yes: the combo is designed to show only one column when not dropped down.

One alternative is to place a text box alongside the combo, and set its
Control Source to:
   =[Combo1].Column(1)
The first column is zero, so Column(1) shows the 2nd column of Combo1.

Another alternative is to concatenate the values from 2 fields together.
This example shows the Surname and FirstName without dropping the combo
down:
RowSource:
   SELECT ClientID, Surname & ", " + FirstName AS ClientName
   FROM tblClient
   ORDER BY Surname, FirstName;
Column Count        2
Column Widths      0