Lookup fields configured as a Radio Button List will have a single column by default. In the example below, the Employee Last Name lookup is a single-column radio button list.
  
  Let’s configure Employee Last Name with multiple columns.
  Start the Project Designer. In the Project Explorer, switch to the Controllers tab and double-click on Orders / Views / editForm1 / c1 – Orders / EmployeeID data field node.
  
  Change the Columns property:
              | Property | New Value | 
             | Columns | 3 | 
   
Press OK to save. On the toolbar, press Browse.
  Navigate to the Orders page, and edit a record. The radio button list for Employee Last Name field will be rendered in three columns.
  