XCode имеет функцию навигации по коду?

Я изменил ваш код, чтобы гарантировать, что все переменные объявлены.

Sub HideRows()
'Ensure you declare all your variables
Dim ws1 As Worksheet, ws2 As Worksheet, lRow As Long
Dim ColumnOne As Integer, ColumnTwo As Integer
Dim dRng As Range, eRng As Range
Dim dRngCnt As Long, eRngCnt As Long

'Assign worksheets and variables
Set ws1 = ThisWorkbook.Sheets("Sheet1")
Set ws2 = ThisWorkbook.Sheets("Sheet2")

'Identifying the specific range as variable
Set dRng = ws2.Range("D2:D9")
Set eRng = ws2.Range("E2:E9")

'Assigning a variable to the countA will simplify your IF and ELSEIF statements
dRngCnt = Application.WorksheetFunction.CountA(dRng)
eRngCnt = Application.WorksheetFunction.CountA(eRng)

    With ws1
        ColumnOne = .Cells(1, .Columns.Count).End(xlToLeft).Column
        'I replaced "lastColumn" with "ColumnOne", because they are the same value, so you only need to use one
        lRow = .Cells(.Rows.Count, ColumnOne).End(xlUp).Row
        ColumnTwo = ColumnOne - 1

        If dRngCnt <> 0 Then 'I use the countA variable for column D Range
            For i = 1 To lRow
                If .Cells(i, ColumnTwo).Value = 0 Then 'Any 0s in the second to last columns will hide the row
                    .Rows(i).EntireRow.Hidden = True
                End If
            Next i

        ElseIf eRngCnt <> 0 Then 'I use the countA variable for column E Range
            For i = 1 To lRow
                If .Cells(i, ColumnOne).Value = 0 Then
                    .Rows(i).EntireRow.Hidden = True
                End If

            Next i
        Else
            Exit Sub

        End If
    End With

End Sub