diff --git a/app/components/editable_champ/multiple_drop_down_list_component.rb b/app/components/editable_champ/multiple_drop_down_list_component.rb
index 6428d70df..0269ca782 100644
--- a/app/components/editable_champ/multiple_drop_down_list_component.rb
+++ b/app/components/editable_champ/multiple_drop_down_list_component.rb
@@ -17,6 +17,7 @@ class EditableChamp::MultipleDropDownListComponent < EditableChamp::EditableCham
       name: @form.field_name(:value, multiple: true),
       selected_keys: @champ.selected_options,
       items: @champ.enabled_non_empty_options,
+      value_separator: false,
       'aria-label': @champ.libelle,
       'aria-describedby': @champ.describedby_id,
       'aria-labelledby': @champ.labelledby_id)
diff --git a/app/components/instructeurs/column_picker_component/column_picker_component.html.haml b/app/components/instructeurs/column_picker_component/column_picker_component.html.haml
index 74a31729e..a5953d0be 100644
--- a/app/components/instructeurs/column_picker_component/column_picker_component.html.haml
+++ b/app/components/instructeurs/column_picker_component/column_picker_component.html.haml
@@ -1,5 +1,5 @@
 = form_tag update_displayed_fields_instructeur_procedure_path(@procedure), method: :patch, class: 'dropdown-form large columns-form' do
   %react-fragment
-    = render ReactComponent.new "ComboBox/MultiComboBox", items: @displayable_columns_for_select, selected_keys: @displayable_columns_selected, name: 'values[]', 'aria-label': 'Colonne à afficher'
+    = render ReactComponent.new "ComboBox/MultiComboBox", items: @displayable_columns_for_select, selected_keys: @displayable_columns_selected, name: 'values[]', 'aria-label': 'Colonne à afficher', value_separator: false
 
   = submit_tag t('.save'), class: 'fr-btn fr-btn--secondary'
diff --git a/app/javascript/components/react-aria/hooks.ts b/app/javascript/components/react-aria/hooks.ts
index df940e0f0..5df65dda7 100644
--- a/app/javascript/components/react-aria/hooks.ts
+++ b/app/javascript/components/react-aria/hooks.ts
@@ -168,13 +168,18 @@ export function useMultiList({
   defaultItems?: Item[];
   defaultSelectedKeys?: string[];
   allowsCustomValue?: boolean;
-  valueSeparator?: string;
+  valueSeparator?: string | false;
   onChange?: () => void;
   focusInput?: () => void;
   formValue?: 'text' | 'key';
 }) {
   const valueSeparatorRegExp = useMemo(
-    () => (valueSeparator ? new RegExp(valueSeparator) : /\s|,|;/),
+    () =>
+      valueSeparator === false
+        ? false
+        : valueSeparator
+          ? new RegExp(valueSeparator)
+          : /\s|,|;/,
     [valueSeparator]
   );
   const [selectedKeys, setSelectedKeys] = useState(
@@ -219,7 +224,7 @@ export function useMultiList({
     const values = selectedItems.map((item) =>
       formValue == 'text' || allowsCustomValue ? item.label : item.value
     );
-    if (!allowsCustomValue || inputValue == '') {
+    if (!valueSeparatorRegExp || !allowsCustomValue || inputValue == '') {
       return values;
     }
     return [
@@ -269,26 +274,34 @@ export function useMultiList({
         setInputValue('');
         return;
       }
-      if (allowsCustomValue) {
-        const values = value.split(valueSeparatorRegExp);
-        // if input contains a separator, add all values
-        if (values.length > 1) {
-          const addedKeys = values.filter(Boolean);
-          setSelectedKeys((keys) => {
-            const selectedKeys = new Set(keys.values());
-            for (const key of addedKeys) {
-              selectedKeys.add(key);
-            }
-            return selectedKeys;
-          });
-          setInputValue('');
-        } else {
-          setInputValue(value);
-        }
-        onChange?.();
-      } else {
+
+      if (!valueSeparatorRegExp) {
         setInputValue(value);
+        return;
       }
+
+      const values = value.split(valueSeparatorRegExp);
+      if (values.length < 2) {
+        setInputValue(value);
+        return;
+      }
+
+      // if input contains a separator, add all values
+      const addedKeys = allowsCustomValue
+        ? values.filter(Boolean)
+        : values
+            .filter(Boolean)
+            .map((value) => items.find((item) => item.label == value)?.value)
+            .filter((key) => key != null);
+      setSelectedKeys((keys) => {
+        const selectedKeys = new Set(keys.values());
+        for (const key of addedKeys) {
+          selectedKeys.add(key);
+        }
+        return selectedKeys;
+      });
+      onChange?.();
+      setInputValue('');
     }
   );
 
diff --git a/app/javascript/components/react-aria/props.ts b/app/javascript/components/react-aria/props.ts
index 10d62859a..0b4347de5 100644
--- a/app/javascript/components/react-aria/props.ts
+++ b/app/javascript/components/react-aria/props.ts
@@ -56,7 +56,7 @@ export const MultiComboBoxProps = s.assign(
     s.object({
       selectedKeys: s.array(s.string()),
       allowsCustomValue: s.boolean(),
-      valueSeparator: s.string()
+      valueSeparator: s.union([s.string(), s.literal(false)])
     })
   )
 );
diff --git a/spec/system/instructeurs/expert_spec.rb b/spec/system/instructeurs/expert_spec.rb
index c1e70385a..eb8e7b78f 100644
--- a/spec/system/instructeurs/expert_spec.rb
+++ b/spec/system/instructeurs/expert_spec.rb
@@ -7,6 +7,8 @@ describe 'Inviting an expert:', js: true do
   let(:instructeur) { create(:instructeur, password: SECURE_PASSWORD) }
   let(:expert) { create(:expert, password: expert_password) }
   let(:expert2) { create(:expert, password: expert_password) }
+  let(:expert3) { create(:expert, password: expert_password) }
+  let(:expert4) { create(:expert, password: expert_password) }
   let(:expert_password) { 'mot de passe d’expert' }
   let(:procedure) { create(:procedure, :published, instructeurs: [instructeur], types_de_champ_public: [{ type: :dossier_link }]) }
   let(:dossier) { create(:dossier, :en_construction, :with_populated_champs, procedure:) }
@@ -31,6 +33,7 @@ describe 'Inviting an expert:', js: true do
       within('.fr-sidemenu') { click_on 'Demander un avis' }
       expect(page).to have_current_path(avis_new_instructeur_dossier_path(procedure, dossier))
 
+      fill_in 'Emails', with: "#{expert3.email},#{expert4.email}"
       fill_in 'Emails', with: "#{expert.email},"
       fill_in 'Emails', with: expert2.email
       fill_in 'avis_introduction', with: 'Bonjour, merci de me donner votre avis sur ce dossier.'
@@ -45,10 +48,12 @@ describe 'Inviting an expert:', js: true do
       within('section') do
         expect(page).to have_content(expert.email.to_s)
         expect(page).to have_content(expert2.email.to_s)
+        expect(page).to have_content(expert3.email.to_s)
+        expect(page).to have_content(expert4.email.to_s)
         expect(page).to have_content('Bonjour, merci de me donner votre avis sur ce dossier.')
       end
 
-      expect(Avis.count).to eq(4)
+      expect(Avis.count).to eq(8)
       expect(emails_sent_to(expert.email.to_s).size).to eq(1)
       expect(emails_sent_to(expert2.email.to_s).size).to eq(1)
       invitation_email = open_email(expert.email.to_s)