If you mean the data validation list dropdown, then as far as I know you can't change it.
One workaround is to use the SelectionChange event to increase the zoom when you select a cell with that validation type applied.
For example, this changes the zoom to 150% for when you click on a cell with a list, and 55% otherwise.
Private Sub Worksheet_selectionChange(ByVal Target As Range)
Dim dv As XlDVType
With Target
If .Count = 1 Then
On Error Resume Next
dv = .Validation.Type
On Error GoTo 0
ActiveWindow.Zoom = IIf(dv = xlValidateList, 150, 55)
End If
End With
End Sub
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