I can add a new column and a new row

docs/DataGrid.md

@@ -151,18 +151,6 @@ The DataGrid automatically detects column types from pandas dtypes:
 | `datetime64`       | Datetime      | Formatted date          |
 | `object`, others   | Text          | Left-aligned, truncated |
 
-### Row Index Column
-
-By default, the DataGrid displays a row index column on the left. This can be useful for identifying rows:
-
-```python
-# Row index is enabled by default
-grid._state.row_index = True
-
-# To disable the row index column
-grid._state.row_index = False
-grid.init_from_dataframe(df)
-```
 
 ## Column Features