memory leak in responsie list?

There appears to be a memory leak in your responsive list component. I ran the fmx demo (RLDemo) under Delphi Seattle and added ReportMemoryLeaksOnShutdown := True.  If you select a couple of items then close it down you get the following:
---------------------------
Unexpected Memory Leak
---------------------------
An unexpected memory leak has occurred. The unexpected small block leaks are:

13 - 20 bytes: UnicodeString x 1
29 - 36 bytes: UnicodeString x 1
37 - 44 bytes: Unknown x 1
45 - 52 bytes: UnicodeString x 1
69 - 76 bytes: UnicodeString x 1
85 - 92 bytes: TStringList x 1

---------------------------
OK  
---------------------------

The memory leak is not in the component but in the demo itself.
We've fixed this now.

To fix this in your demo, add col.Free in the finally clause

procedure TForm4.FormCreate(Sender: TObject);
var
  sl,col: TStringList;
  i: integer;
begin
  ReportMemoryLeaksOnShutdown := true;

  TMSFNCResponsiveList1.Items.Clear;

  sl := TStringList.Create;
  col := TStringList.Create;
  col.StrictDelimiter := true;
  col.Delimiter := ',';

  TMSFNCResponsiveList1.BeginUpdate;

  try
    sl.LoadFromFile('.\carlist.txt');

    for i := 0 to sl.Count - 1 do
    begin
      col.CommaText := sl.Strings;
      TMSFNCResponsiveList1.Items.Add.Content := '<B>'+col[0]+'</B>'+'<BR><IMG SRC="file://.'+col[2]+'"><BR><BR>'+col[1];
    end;

  finally
    TMSFNCResponsiveList1.EndUpdate;
    col.Free;
    sl.Free;
  end;
end;