diff --git a/mailpoet/assets/js/src/email_editor_custom/engine/components/block-editor/block-editor.tsx b/mailpoet/assets/js/src/email_editor_custom/engine/components/block-editor/block-editor.tsx
index 3d777ca24d..0590c9f615 100644
--- a/mailpoet/assets/js/src/email_editor_custom/engine/components/block-editor/block-editor.tsx
+++ b/mailpoet/assets/js/src/email_editor_custom/engine/components/block-editor/block-editor.tsx
@@ -1,6 +1,7 @@
 import {
   BlockEditorKeyboardShortcuts,
   BlockEditorProvider,
+  BlockInspector,
   // eslint-disable-next-line @typescript-eslint/ban-ts-comment
   // @ts-ignore No types for this exist yet.
   BlockTools,
@@ -10,6 +11,8 @@ import {
 } from '@wordpress/block-editor';
 import { useState } from '@wordpress/element';
 
+import { Sidebar } from '../sidebar/sidebar';
+
 export function BlockEditor() {
   const [documentBlocks, updateBlocks] = useState([]);
 
@@ -33,6 +36,9 @@ export function BlockEditor() {
             onChange={(blocks) => updateBlocks(blocks)}
             settings={{}}
           >
+            <Sidebar.InspectorFill>
+              <BlockInspector />
+            </Sidebar.InspectorFill>
             <div className="editor-styles-wrapper">
               {/* eslint-disable-next-line @typescript-eslint/ban-ts-comment */}
               {/* @ts-ignore BlockEditorKeyboardShortcuts.Register has no types */}
diff --git a/mailpoet/assets/js/src/email_editor_custom/engine/components/header/header.tsx b/mailpoet/assets/js/src/email_editor_custom/engine/components/header/header.tsx
index 277871cada..ef331f76fa 100644
--- a/mailpoet/assets/js/src/email_editor_custom/engine/components/header/header.tsx
+++ b/mailpoet/assets/js/src/email_editor_custom/engine/components/header/header.tsx
@@ -1,3 +1,6 @@
+import { PinnedItems } from '@wordpress/interface';
+import { storeName } from '../../store';
+
 export function Header() {
   return (
     <div className="edit-post-header">
@@ -5,7 +8,9 @@ export function Header() {
         <div className="edit-post-header-toolbar">Todo Inserter etc.</div>
         <div className="edit-post-header__center">Todo Email Name</div>
       </div>
-      <div className="edit-post-header__settings">Todo Actions</div>
+      <div className="edit-post-header__settings">
+        <PinnedItems.Slot scope={storeName} />
+      </div>
     </div>
   );
 }
diff --git a/mailpoet/assets/js/src/email_editor_custom/engine/components/sidebar/sidebar.tsx b/mailpoet/assets/js/src/email_editor_custom/engine/components/sidebar/sidebar.tsx
new file mode 100644
index 0000000000..74780a8924
--- /dev/null
+++ b/mailpoet/assets/js/src/email_editor_custom/engine/components/sidebar/sidebar.tsx
@@ -0,0 +1,33 @@
+import { createSlotFill, Panel } from '@wordpress/components';
+import { __ } from '@wordpress/i18n';
+import { ComplementaryArea } from '@wordpress/interface';
+import { ComponentProps } from 'react';
+import { storeName, mainSidebarKey } from 'email_editor_custom/engine/store';
+import { drawerRight } from '@wordpress/icons';
+
+const { Slot: InspectorSlot, Fill: InspectorFill } = createSlotFill(
+  'EmailEditorBlockInspector',
+);
+
+type Props = ComponentProps<typeof ComplementaryArea>;
+
+export function Sidebar(props: Props): JSX.Element {
+  return (
+    <ComplementaryArea
+      identifier={mainSidebarKey}
+      className="edit-post-sidebar"
+      header={<h2>Todo header</h2>}
+      icon={drawerRight}
+      scope={storeName}
+      smallScreenTitle={__('No title', 'mailpoet')}
+      isActiveByDefault
+      {...props}
+    >
+      <Panel header={__('Inspector')}>
+        <InspectorSlot bubblesVirtually />
+      </Panel>
+    </ComplementaryArea>
+  );
+}
+
+Sidebar.InspectorFill = InspectorFill;
diff --git a/mailpoet/assets/js/src/email_editor_custom/engine/editor.tsx b/mailpoet/assets/js/src/email_editor_custom/engine/editor.tsx
index 9b0a3b83a5..f3d2f33939 100644
--- a/mailpoet/assets/js/src/email_editor_custom/engine/editor.tsx
+++ b/mailpoet/assets/js/src/email_editor_custom/engine/editor.tsx
@@ -1,17 +1,38 @@
-import { InterfaceSkeleton } from '@wordpress/interface';
+import classnames from 'classnames';
+import { useSelect } from '@wordpress/data';
+import { InterfaceSkeleton, ComplementaryArea } from '@wordpress/interface';
 import { StrictMode, createRoot } from '@wordpress/element';
 import { registerCoreBlocks } from '@wordpress/block-library';
 import { Popover, SlotFillProvider } from '@wordpress/components';
 import { ShortcutProvider } from '@wordpress/keyboard-shortcuts';
 import { Header } from './components/header';
 import { BlockEditor } from './components/block-editor';
+import { Sidebar } from './components/sidebar/sidebar';
+import { createStore, storeName } from './store';
 
 function Editor() {
+  const { isSidebarOpened } = useSelect(
+    (select) => ({
+      isSidebarOpened: select(storeName).isSidebarOpened(),
+    }),
+    [],
+  );
+
+  const className = classnames('interface-interface-skeleton', {
+    'is-sidebar-opened': isSidebarOpened,
+  });
+
   return (
     <StrictMode>
       <ShortcutProvider>
         <SlotFillProvider>
-          <InterfaceSkeleton header={<Header />} content={<BlockEditor />} />
+          <Sidebar />
+          <InterfaceSkeleton
+            className={className}
+            header={<Header />}
+            content={<BlockEditor />}
+            sidebar={<ComplementaryArea.Slot scope={storeName} />}
+          />
           <Popover.Slot />
         </SlotFillProvider>
       </ShortcutProvider>
@@ -20,6 +41,7 @@ function Editor() {
 }
 
 export function initialize(elementId: string) {
+  createStore();
   const container = document.getElementById(elementId);
   if (!container) {
     return;
diff --git a/mailpoet/assets/js/src/email_editor_custom/engine/store/actions.ts b/mailpoet/assets/js/src/email_editor_custom/engine/store/actions.ts
new file mode 100644
index 0000000000..ecfaff42da
--- /dev/null
+++ b/mailpoet/assets/js/src/email_editor_custom/engine/store/actions.ts
@@ -0,0 +1,17 @@
+import { dispatch } from '@wordpress/data';
+import { store as interfaceStore } from '@wordpress/interface';
+import { storeName } from './constants';
+
+export function toggleInserterSidebar() {
+  return {
+    type: 'TOGGLE_INSERTER_SIDEBAR',
+  } as const;
+}
+
+export const openSidebar = () => {
+  dispatch(interfaceStore).enableComplementaryArea(storeName);
+};
+
+export const closeSidebar = () => {
+  dispatch(interfaceStore).disableComplementaryArea(storeName);
+};
diff --git a/mailpoet/assets/js/src/email_editor_custom/engine/store/constants.ts b/mailpoet/assets/js/src/email_editor_custom/engine/store/constants.ts
new file mode 100644
index 0000000000..30f2cfe550
--- /dev/null
+++ b/mailpoet/assets/js/src/email_editor_custom/engine/store/constants.ts
@@ -0,0 +1,3 @@
+export const storeName = 'email-editor/editor';
+
+export const mainSidebarKey = 'email-editor/editor/main';
diff --git a/mailpoet/assets/js/src/email_editor_custom/engine/store/index.ts b/mailpoet/assets/js/src/email_editor_custom/engine/store/index.ts
new file mode 100644
index 0000000000..d08c8ff609
--- /dev/null
+++ b/mailpoet/assets/js/src/email_editor_custom/engine/store/index.ts
@@ -0,0 +1,3 @@
+export * from './constants';
+export * from './store';
+export * from './types';
diff --git a/mailpoet/assets/js/src/email_editor_custom/engine/store/initial_state.ts b/mailpoet/assets/js/src/email_editor_custom/engine/store/initial_state.ts
new file mode 100644
index 0000000000..e51decfa05
--- /dev/null
+++ b/mailpoet/assets/js/src/email_editor_custom/engine/store/initial_state.ts
@@ -0,0 +1,9 @@
+import { State } from './types';
+
+export function getInitialState(): State {
+  return {
+    inserterSidebar: {
+      isOpened: false,
+    },
+  };
+}
diff --git a/mailpoet/assets/js/src/email_editor_custom/engine/store/reducer.ts b/mailpoet/assets/js/src/email_editor_custom/engine/store/reducer.ts
new file mode 100644
index 0000000000..db530081b1
--- /dev/null
+++ b/mailpoet/assets/js/src/email_editor_custom/engine/store/reducer.ts
@@ -0,0 +1,16 @@
+import { State } from './types';
+
+export function reducer(state: State, action): State {
+  switch (action.type) {
+    case 'TOGGLE_INSERTER_SIDEBAR':
+      return {
+        ...state,
+        inserterSidebar: {
+          ...state.inserterSidebar,
+          isOpened: !state.inserterSidebar.isOpened,
+        },
+      };
+    default:
+      return state;
+  }
+}
diff --git a/mailpoet/assets/js/src/email_editor_custom/engine/store/selectors.ts b/mailpoet/assets/js/src/email_editor_custom/engine/store/selectors.ts
new file mode 100644
index 0000000000..967dee8012
--- /dev/null
+++ b/mailpoet/assets/js/src/email_editor_custom/engine/store/selectors.ts
@@ -0,0 +1,8 @@
+import { createRegistrySelector } from '@wordpress/data';
+import { store as interfaceStore } from '@wordpress/interface';
+import { storeName } from './constants';
+
+export const isSidebarOpened = createRegistrySelector(
+  (select) => (): boolean =>
+    !!select(interfaceStore).getActiveComplementaryArea(storeName),
+);
diff --git a/mailpoet/assets/js/src/email_editor_custom/engine/store/store.ts b/mailpoet/assets/js/src/email_editor_custom/engine/store/store.ts
new file mode 100644
index 0000000000..3d515de8d3
--- /dev/null
+++ b/mailpoet/assets/js/src/email_editor_custom/engine/store/store.ts
@@ -0,0 +1,47 @@
+import { createReduxStore, register } from '@wordpress/data';
+import {
+  ReduxStoreConfig,
+  StoreDescriptor as GenericStoreDescriptor,
+} from '@wordpress/data/build-types/types';
+import { controls } from '@wordpress/data-controls';
+import * as actions from './actions';
+import { storeName } from './constants';
+import { getInitialState } from './initial_state';
+import { reducer } from './reducer';
+import * as selectors from './selectors';
+
+const getConfig = () =>
+  ({
+    actions,
+    controls,
+    selectors,
+    reducer,
+    initialState: getInitialState(),
+  } as const);
+
+export type EditorStoreConfig = ReturnType<typeof getConfig>;
+
+export const createStore = () => {
+  const store = createReduxStore(storeName, getConfig());
+  register(store);
+  return store;
+};
+
+export interface EmailEditorStore {
+  getActions(): EditorStoreConfig['actions'];
+  getSelectors(): EditorStoreConfig['selectors'];
+}
+
+declare module '@wordpress/data' {
+  interface StoreMap {
+    [storeName]: GenericStoreDescriptor<
+      ReduxStoreConfig<
+        unknown,
+        ReturnType<EmailEditorStore['getActions']>,
+        ReturnType<EmailEditorStore['getSelectors']>
+      >
+    >;
+  }
+}
+
+export { actions, selectors };
diff --git a/mailpoet/assets/js/src/email_editor_custom/engine/store/types.ts b/mailpoet/assets/js/src/email_editor_custom/engine/store/types.ts
new file mode 100644
index 0000000000..cbfe98c46a
--- /dev/null
+++ b/mailpoet/assets/js/src/email_editor_custom/engine/store/types.ts
@@ -0,0 +1,5 @@
+export type State = {
+  inserterSidebar: {
+    isOpened: boolean;
+  };
+};
diff --git a/mailpoet/assets/js/src/types/wordpress-modules.ts b/mailpoet/assets/js/src/types/wordpress-modules.ts
index 5cd5029caf..d6d8d6dfed 100644
--- a/mailpoet/assets/js/src/types/wordpress-modules.ts
+++ b/mailpoet/assets/js/src/types/wordpress-modules.ts
@@ -48,9 +48,11 @@ declare module '@wordpress/edit-post' {
 // there are no @types/wordpress__interface yet
 declare module '@wordpress/interface' {
   import { StoreDescriptor } from '@wordpress/data/build-types/types';
+  import * as interfaceActions from '@wordpress/interface/src/store/actions';
 
   export const store: { name: 'core/interface' } & StoreDescriptor<{
     reducer: () => unknown;
+    actions: typeof interfaceActions;
     selectors: {
       getActiveComplementaryArea: (
         state: unknown,