diff --git a/app/assets/stylesheets/dsfr.scss b/app/assets/stylesheets/dsfr.scss
index 6478ea3c7..baddb347c 100644
--- a/app/assets/stylesheets/dsfr.scss
+++ b/app/assets/stylesheets/dsfr.scss
@@ -89,6 +89,21 @@ trix-editor.fr-input {
     }
   }
 }
+/* prettier-ignore */
+.fr-nav__item.section-active {
+  position: relative;
+
+  &::after {
+    content: '';  // scss-lint:disable StringQuotes
+    position: absolute;
+    bottom: -2px;
+    left: 0;
+    width: 100%;
+    height: 2px;
+    background-color: var(--blue-france-sun-113-625);
+    transform: translateY(100%);
+  }
+}
 
 @keyframes popover-slide {
   from {
diff --git a/app/helpers/navigation_helper.rb b/app/helpers/navigation_helper.rb
new file mode 100644
index 000000000..870785327
--- /dev/null
+++ b/app/helpers/navigation_helper.rb
@@ -0,0 +1,33 @@
+# frozen_string_literal: true
+
+module NavigationHelper
+  def current_nav_section
+    if procedure_management_section?
+      'procedure_management'
+    elsif user_support_section?
+      'user_support'
+    elsif downloads_section?
+      'downloads'
+    else
+      'follow_up'
+    end
+  end
+
+  private
+
+  def procedure_management_section?
+    return true if params[:action].in?(['administrateurs', 'stats', 'email_notifications', 'deleted_dossiers'])
+    return true if params[:controller] == 'instructeurs/groupe_instructeurs'
+
+    false
+  end
+
+  def user_support_section?
+    params[:action] == 'email_usagers' || params[:action] == 'apercu'
+  end
+
+  def downloads_section?
+    params[:action] == 'exports' ||
+    params[:controller] == 'instructeurs/archives'
+  end
+end
diff --git a/app/views/instructeurs/procedures/_header.html.haml b/app/views/instructeurs/procedures/_header.html.haml
index 66b6fa33a..fe3208ff9 100644
--- a/app/views/instructeurs/procedures/_header.html.haml
+++ b/app/views/instructeurs/procedures/_header.html.haml
@@ -1,23 +1,24 @@
 .procedure-header
-  .clipboard-container.flex
-    = link_to "javascript:history.back()", class: "fr-btn btn-back" do
-      %span.fr-icon-arrow-left-line{ "aria-hidden" => "true", style: "font-size: 14px;" }
-
+  .clipboard-container
     %h1.fr-h3
       = "#{procedure_libelle procedure} (n°#{procedure.id})"
   %nav.flex.align-center.fr-translate.fr-nav{ role: "navigation", "aria-label"=> t('instructeurs.dossiers.header.banner.procedure_navigation') }
-    .fr-nav__item
+    .fr-nav__item{ class: ('section-active' if current_nav_section == 'follow_up') }
       = link_to instructeur_procedure_path(procedure), class: "account-btn fr-btn fr-btn--tertiary fr-btn--no-border", style: "box-shadow: none; background: none;" do
         %span.fr-mr-1w= t('instructeurs.dossiers.header.banner.follow_up')
-    .fr-nav__item.relative
+    .fr-nav__item.relative{ class: ('section-active' if current_nav_section == 'procedure_management') }
       %button.account-btn.fr-translate__btn.fr-btn.fr-btn--tertiary.fr-btn--no-border.fr-text--md{ "aria-controls" => "procedure-management", "aria-expanded" => "false", style: "box-shadow: none; background: none;" }
         = t('instructeurs.dossiers.header.banner.procedure_management')
       #procedure-management.fr-collapse.fr-menu.absolute
         %ul.fr-menu__list
           %li
             = link_to t('instructeurs.dossiers.header.banner.administrators_list'), administrateurs_instructeur_procedure_path(procedure), class: 'fr-nav__link'
-          %li
-            = link_to t('instructeurs.dossiers.header.banner.instructeurs'), instructeur_groupes_path(procedure), class: 'fr-nav__link'
+          - if procedure.instructeurs_self_management_enabled?
+            %li
+              = link_to t('instructeurs.dossiers.header.banner.instructeurs'), instructeur_groupes_path(procedure), class: 'fr-nav__link'
+          - elsif procedure.administrateurs.exists?(id: current_administrateur&.id)
+            %li
+              = link_to t('instructeurs.dossiers.header.banner.instructeurs'), admin_procedure_groupe_instructeurs_path(procedure), class: 'fr-nav__link'
           %li
             = link_to t('instructeurs.dossiers.header.banner.notification_management'), email_notifications_instructeur_procedure_path(procedure), class: 'fr-nav__link'
           %li
@@ -25,7 +26,7 @@
           %li
             = link_to t('views.instructeurs.dossiers.show_deleted_dossiers'), deleted_dossiers_instructeur_procedure_path(@procedure), class: 'fr-nav__link'
 
-    .fr-nav__item.relative
+    .fr-nav__item.relative{ class: ('section-active' if current_nav_section == 'user_support') }
       %button.account-btn.fr-translate__btn.fr-btn.fr-btn--tertiary.fr-btn--no-border.fr-text--md{ "aria-controls" => "user-support", "aria-expanded" => "false", style: "box-shadow: none; background: none;" }
         = t('instructeurs.dossiers.header.banner.user_support')
       #user-support.fr-collapse.fr-menu.absolute
@@ -38,7 +39,7 @@
             = link_to "#", class: "fr-nav__link fr-link fr-link--md fr-link--icon-left fr-icon-clipboard-line", data: {controller: "clipboard", clipboard_text_value: commencer_url(@procedure.path), action: "click->clipboard#copy" } do
               = t('instructeurs.dossiers.header.banner.copy_link_button')
 
-    .fr-nav__item.relative
+    .fr-nav__item.relative{ class: ('section-active' if current_nav_section == 'downloads') }
       %button.account-btn.fr-translate__btn.fr-btn.fr-btn--tertiary.fr-btn--no-border.fr-text--md{ "aria-controls" => "downloads", "aria-expanded" => "false", style: "box-shadow: none; background: none;" }
         = t('instructeurs.dossiers.header.banner.downloads')
       #downloads.fr-collapse.fr-menu.absolute
@@ -49,6 +50,8 @@
             = link_to t('instructeurs.dossiers.header.banner.archives'), instructeur_archives_path(procedure), class: 'fr-nav__link'
           %li
             = link_to t('instructeurs.dossiers.header.banner.exports_models'), exports_instructeur_procedure_path(procedure), class: 'fr-nav__link'
+  - if @has_export_notification
+    %span.notifications{ 'aria-label': t('instructeurs.dossiers.header.banner.exports_notification_label') }
 
-  -# #last-export-alert
-  -#   = render partial: "last_export_alert", locals: { export: @last_export, statut: @statut }
+  #last-export-alert
+    = render partial: "instructeurs/procedures/last_export_alert", locals: { export: @last_export, statut: @statut }