Close opend sheets from a Dropdown List

I have used the following code to open sheets displayed from a dropdown list.

Sub Oval3_Click()
    
    On Error Resume Next
    With Sheets(Sheets("Index").Range("C13").Text)
        .Visible = xlSheetVisible
        .Select
    End With
    
End Sub

I tried to modify the code to be able to close the sheet in the same manner but my very poor VBA skill leave me at a brick wall. I tried,

Sub Oval4_Click()
    
    On Error Resume Next
    With Sheets(Sheets("Index").Range("C13").Text)
        .Visible = False xlSheet
        .Select
    End With
    
End Sub

but I am getting an error msg.

Jim O