diff --git a/docs/Theming.md b/docs/Theming.md
index f277df3f3ac..601e742e461 100644
--- a/docs/Theming.md
+++ b/docs/Theming.md
@@ -916,7 +916,7 @@ import Badge from '@material-ui/core/Badge';
 } />
 ```
 
-The `icon` prop allows to set the menu left icon.
+The `letfIcon` prop allows to set the menu left icon.
 
 Additional props are passed down to [the underling material-ui `<MenuItem>` component](https://material-ui.com/api/menu-item/#menuitem-api).
 
diff --git a/packages/ra-ui-materialui/src/layout/Menu.tsx b/packages/ra-ui-materialui/src/layout/Menu.tsx
index 0a8290d2dd5..e803e734a49 100644
--- a/packages/ra-ui-materialui/src/layout/Menu.tsx
+++ b/packages/ra-ui-materialui/src/layout/Menu.tsx
@@ -4,7 +4,6 @@ import PropTypes from 'prop-types';
 import { shallowEqual, useSelector } from 'react-redux';
 import lodashGet from 'lodash/get';
 // @ts-ignore
-import { useMediaQuery, Theme } from '@material-ui/core';
 import { makeStyles } from '@material-ui/core/styles';
 import DefaultIcon from '@material-ui/icons/ViewList';
 import classnames from 'classnames';
diff --git a/packages/ra-ui-materialui/src/layout/Sidebar.tsx b/packages/ra-ui-materialui/src/layout/Sidebar.tsx
index 37cd3797414..62f2a9dcc7e 100644
--- a/packages/ra-ui-materialui/src/layout/Sidebar.tsx
+++ b/packages/ra-ui-materialui/src/layout/Sidebar.tsx
@@ -1,5 +1,5 @@
 import * as React from 'react';
-import { Children, cloneElement, ReactElement } from 'react';
+import { ReactElement } from 'react';
 import PropTypes from 'prop-types';
 import { useDispatch, useSelector } from 'react-redux';
 import { Drawer, DrawerProps, useMediaQuery, Theme } from '@material-ui/core';