diff --git a/lang/en/calendar.php b/lang/en/calendar.php
index 81dd935..19e32af 100644
--- a/lang/en/calendar.php
+++ b/lang/en/calendar.php
@@ -47,6 +47,7 @@ return [
         'title' => 'Calendar settings',
     ],
     'timezone_help' => 'You can override your default time zone here.',
+    'toggle_sidebar' => 'Toggle calendar sidebar',
     'event' => [
         'when' => 'When',
         'all_day' => 'All day',
diff --git a/lang/it/calendar.php b/lang/it/calendar.php
index 17dc39b..2e22574 100644
--- a/lang/it/calendar.php
+++ b/lang/it/calendar.php
@@ -47,6 +47,7 @@ return [
         'title' => 'Impostazioni calendario',
     ],
     'timezone_help' => 'Puoi sovrascrivere il tuo fuso orario predefinito qui.',
+    'toggle_sidebar' => 'Mostra o nascondi la barra laterale del calendario',
     'event' => [
         'when' => 'Quando',
         'all_day' => 'Tutto il giorno',
diff --git a/resources/css/etc/layout.css b/resources/css/etc/layout.css
index 2db5e23..08e9a19 100644
--- a/resources/css/etc/layout.css
+++ b/resources/css/etc/layout.css
@@ -245,7 +245,18 @@ main {
 
         /* section specific */
         &#calendar {
-            /* */
+            header {
+                h2 {
+                    .calendar-expand-toggle {
+                        @apply ml-1 opacity-0 pointer-events-none transition-opacity duration-150;
+                    }
+
+                    &:hover .calendar-expand-toggle,
+                    &:focus-within .calendar-expand-toggle {
+                        @apply opacity-100 pointer-events-auto;
+                    }
+                }
+            }
         }
         &#settings {
             /* */
diff --git a/resources/js/app.js b/resources/js/app.js
index 61953ef..9d862f9 100644
--- a/resources/js/app.js
+++ b/resources/js/app.js
@@ -1,6 +1,16 @@
 import './bootstrap';
 import htmx from 'htmx.org';
 
+const SELECTORS = {
+    calendarToggle: '.calendar-toggle',
+    calendarViewForm: '#calendar-view',
+    calendarExpandToggle: '[data-calendar-expand]',
+    colorPicker: '[data-colorpicker]',
+    colorPickerColor: '[data-colorpicker-color]',
+    colorPickerHex: '[data-colorpicker-hex]',
+    colorPickerRandom: '[data-colorpicker-random]',
+};
+
 /**
  * htmx/global
  */
@@ -19,34 +29,43 @@ document.addEventListener('htmx:configRequest', (evt) => {
 })
 
 /**
- * calendar toggle
+ * calendar ui
  * progressive enhancement on html form with no js
  */
-document.addEventListener('change', event => {
-    const checkbox = event.target;
+document.addEventListener('change', (event) => {
+    const target = event.target;
 
-    // ignore anything that isn’t one of our checkboxes
-    if (!checkbox.matches('.calendar-toggle')) return;
+    if (target?.matches(SELECTORS.calendarToggle)) {
+        const slug = target.value;
+        const show = target.checked;
 
-    const slug = checkbox.value;
-    const show = checkbox.checked;
+        document
+            .querySelectorAll(`[data-calendar="${slug}"]`)
+            .forEach(el => el.classList.toggle('hidden', !show));
+        return;
+    }
 
-    // toggle .hidden on every matching event element
-    document
-        .querySelectorAll(`[data-calendar="${slug}"]`)
-        .forEach(el => el.classList.toggle('hidden', !show));
+    const form = target?.form;
+    if (!form || form.id !== 'calendar-view') return;
+    if (target.name !== 'view') return;
+
+    form.requestSubmit();
 });
 
 /**
- * calendar view picker
- * progressive enhancement on html form with no js
+ * calendar sidebar expand toggle
  */
-document.addEventListener('change', (e) => {
-  const form = e.target?.form;
-  if (!form || form.id !== 'calendar-view') return;
-  if (e.target.name !== 'view') return;
+document.addEventListener('click', (event) => {
+    const toggle = event.target.closest(SELECTORS.calendarExpandToggle);
+    if (!toggle) return;
 
-  form.requestSubmit();
+    event.preventDefault();
+
+    const main = toggle.closest('main');
+    if (!main) return;
+
+    const isExpanded = main.classList.toggle('expanded');
+    toggle.setAttribute('aria-pressed', isExpanded ? 'true' : 'false');
 });
 
 /**
@@ -71,9 +90,9 @@ function initColorPickers(root = document) {
         if (el.__colorpickerWired) return;
         el.__colorpickerWired = true;
 
-        const color = el.querySelector('[data-colorpicker-color]');
-        const hex = el.querySelector('[data-colorpicker-hex]');
-        const btn = el.querySelector('[data-colorpicker-random]');
+        const color = el.querySelector(SELECTORS.colorPickerColor);
+        const hex = el.querySelector(SELECTORS.colorPickerHex);
+        const btn = el.querySelector(SELECTORS.colorPickerRandom);
 
         if (!color || !hex) return;
 
@@ -137,11 +156,15 @@ function initColorPickers(root = document) {
         }
     };
 
-    root.querySelectorAll('[data-colorpicker]').forEach(wire);
+    root.querySelectorAll(SELECTORS.colorPicker).forEach(wire);
+}
+
+function initUI() {
+    initColorPickers();
 }
 
 // initial bind
-document.addEventListener('DOMContentLoaded', () => initColorPickers());
+document.addEventListener('DOMContentLoaded', initUI);
 
 // rebind in htmx for swapped content
 document.addEventListener('htmx:afterSwap', (e) => {
diff --git a/resources/views/calendar/index.blade.php b/resources/views/calendar/index.blade.php
index 50f49d4..a98004d 100644
--- a/resources/views/calendar/index.blade.php
+++ b/resources/views/calendar/index.blade.php
@@ -85,6 +85,14 @@
             @if(!empty($header['span']))
             <span>{{ $header['span'] }}</span>
             @endif
+            <button
+                type="button"
+                class="button button--icon button--sm calendar-expand-toggle"
+                data-calendar-expand
+                aria-label="{{ __('calendar.toggle_sidebar') }}"
+            >
+                <x-icon-chevron-left />
+            </button>
         </h2>
         <menu>
             <li>