When you click first letters of supplier name, you have a list of found suppliers . Displayed information are Supplier ID , Purch org, City and Country
Supplier name is not directly displayed like before 2105
You need to click on Show items to check the complete Supplier Name
S/4HANA Cloud 2105
The Supplier Name will be shown again on the first Screen in 2108 Release
In the meantime open the value help dialog--> you can still see the name of the supplier and also in case you have entered the supplier and leaving the field.
KBA , MM-FIO-PUR-PO , Fiori UI for Purchase Orders , Known Error