diff --git a/app/forms/multiselect.py b/app/forms/multiselect.py
new file mode 100644
index 00000000..77b13626
--- /dev/null
+++ b/app/forms/multiselect.py
@@ -0,0 +1,118 @@
+"""
+Simplification des multiselect HTML/JS
+"""
+
+
+class MultiSelect:
+    """
+    Classe pour faciliter l'utilisation du multi-select HTML/JS
+
+    Les values sont représentées en dict {
+        value: "...",
+        label:"...",
+        selected: True/False (default to False),
+        single: True/False (default to False)
+    }
+
+    Args:
+        values (dict[str, list[dict]]): Dictionnaire des valeurs
+            génère des <optgroup> pour chaque clef du dictionnaire
+            génère des <option> pour chaque valeur du dictionnaire
+        name (str, optional): Nom du multi-select. Defaults to "multi-select".
+        html_id (str, optional): Id HTML du multi-select. Defaults to "multi-select".
+        classname (str, optional): Classe CSS du multi-select. Defaults to "".
+        label (str, optional): Label du multi-select. Defaults to "".
+        export (str, optional): Format du multi-select (HTML/JS). Defaults to "js".
+            HTML : group_ids="val1"&group_ids="val2"...
+            JS : ["val1","val2", ...]
+
+        **kwargs: Arguments supplémentaires (appliqué au multiselect en HTML <multi-select key="value" ...>)
+    """
+
+    def __init__(
+        self,
+        values: dict[str, list[dict]],
+        name="multi-select",
+        html_id="multi-select",
+        label="",
+        classname="",
+        **kwargs,
+    ) -> None:
+        self.values: dict[str, list[dict]] = values
+        self._on = ""
+
+        self.name: str = name
+        self.html_id: str = html_id
+        self.classname: str = classname
+        self.label: str = label or name
+
+        self.args: dict = kwargs
+        self.js: str = ""
+        self.export: str = "return values"
+
+    def html(self) -> str:
+        """
+        Génère l'HTML correspondant au multi-select
+        """
+        opts: list[str] = []
+
+        for key, values in self.values.items():
+            optgroup = f"<optgroup label='{key}'>"
+            for value in values:
+                selected = "selected" if value.get("selected", False) else ""
+                single = "single" if value.get("single", False) else ""
+                opt = f"<option value='{value.get('value')}' {selected} {single} >{value.get('label')}</option>"
+                optgroup += opt
+            optgroup += "</optgroup>"
+            opts.append(optgroup)
+
+        args: list[str] = [f'{key}="{value}"' for key, value in self.args.items()]
+        js: str = "{" + self.js + "}"
+        export: str = "{" + self.export + "}"
+        return f"""
+        <multi-select 
+            label="{self.label}"
+            id="{self.html_id}"
+            name="{self.name}"
+            class="{self.classname}"
+            {" ".join(args)}
+        >
+            {"".join(opts)}
+        </multi-select>
+        <script>
+            window.addEventListener('load', () => {{document.getElementById("{self.html_id}").on((values)=>{js});
+            document.getElementById("{self.html_id}").format((values)=>{export});}} );
+        </script>
+        """
+
+    def change_event(self, js: str) -> None:
+        """
+        Ajoute un évènement de changement au multi-select
+
+        CallBack JS : (event) => {/*actions à effectuer*/}
+
+        Sera retranscrit dans l'HTML comme :
+
+        document.getElementById(%self.id%).on((event)=>{%self.js%})
+
+        Exemple d'utilisation :
+
+        js : "console.log(event.target.value)"
+        """
+        self.js: str = js
+
+    def export_format(self, js: str) -> None:
+        """
+        Met à jour le format de retour de valeur du multi-select
+
+        CallBack JS : (values) => {/*actions à effectuer*/}
+
+        Sera retranscrit dans l'HTML comme :
+
+        document.getElementById(%self.id%).format((values)=>{%self.js%})
+
+        Exemple d'utilisation :
+
+        js : "return values.map(v=> 'val:'+v)"
+        """
+        self.export: str = js
diff --git a/app/scodoc/sco_groups_view.py b/app/scodoc/sco_groups_view.py
index ba15e0fc..2988dc3e 100644
--- a/app/scodoc/sco_groups_view.py
+++ b/app/scodoc/sco_groups_view.py
@@ -750,7 +750,7 @@ def groups_table(
                 name="options",
                 html_id="group_list_options",
             )
-            multi_select.change_event("change_list_options(values)")
+            multi_select.change_event("change_list_options(event.target.value);")
             H.extend(
                 # ;
                 [
diff --git a/app/scodoc/sco_utils.py b/app/scodoc/sco_utils.py
index a97834cb..a51790c7 100644
--- a/app/scodoc/sco_utils.py
+++ b/app/scodoc/sco_utils.py
@@ -63,6 +63,8 @@ from werkzeug.http import HTTP_STATUS_CODES
 from config import Config
 from app import log, ScoDocJSONEncoder
 
+from app.forms.multiselect import MultiSelect
+
 from app.scodoc.codes_cursus import NOTES_TOLERANCE, CODES_EXPL
 from app.scodoc.sco_exceptions import ScoValueError
 from app.scodoc import sco_xml
@@ -445,121 +447,6 @@ def translate_assiduites_metric(metric, inverse=True, short=True) -> str:
         return None
 
 
-class MultiSelect:
-    """
-    Classe pour faciliter l'utilisation du multi-select HTML/JS
-
-    Les values sont représentées en dict {
-        value: "...",
-        label:"...",
-        selected: True/False (default to False),
-        single: True/False (default to False)
-    }
-
-    Args:
-        values (dict[str, list[dict]]): Dictionnaire des valeurs
-            génère des <optgroup> pour chaque clef du dictionnaire
-            génère des <option> pour chaque valeur du dictionnaire
-        name (str, optional): Nom du multi-select. Defaults to "multi-select".
-        html_id (str, optional): Id HTML du multi-select. Defaults to "multi-select".
-        classname (str, optional): Classe CSS du multi-select. Defaults to "".
-        label (str, optional): Label du multi-select. Defaults to "".
-        export (str, optional): Format du multi-select (HTML/JS). Defaults to "js".
-            HTML : group_ids="val1"&group_ids="val2"...
-            JS : ["val1","val2", ...]
-
-        **kwargs: Arguments supplémentaires (appliqué au multiselect en HTML <multi-select key="value" ...>)
-    """
-
-    def __init__(
-        self,
-        values: dict[str, list[dict]],
-        name="multi-select",
-        html_id="multi-select",
-        label="",
-        classname="",
-        **kwargs,
-    ) -> None:
-        self.values: dict[str, list[dict]] = values
-        self._on = ""
-
-        self.name: str = name
-        self.html_id: str = html_id
-        self.classname: str = classname
-        self.label: str = label or name
-
-        self.args: dict = kwargs
-        self.js: str = ""
-        self.export: str = "return values"
-
-    def html(self) -> str:
-        """
-        Génère l'HTML correspondant au multi-select
-        """
-        opts: list[str] = []
-
-        for key, values in self.values.items():
-            optgroup = f"<optgroup label='{key}'>"
-            for value in values:
-                selected = "selected" if value.get("selected", False) else ""
-                single = "single" if value.get("single", False) else ""
-                opt = f"<option value='{value.get('value')}' {selected} {single} >{value.get('label')}</option>"
-                optgroup += opt
-            optgroup += "</optgroup>"
-            opts.append(optgroup)
-
-        args: list[str] = [f'{key}="{value}"' for key, value in self.args.items()]
-        js: str = "{" + self.js + "}"
-        export: str = "{" + self.export + "}"
-        return f"""
-        <multi-select 
-            label="{self.label}"
-            id="{self.html_id}"
-            name="{self.name}"
-            class="{self.classname}"
-            {" ".join(args)}
-        >
-            {"".join(opts)}
-        </multi-select>
-        <script>
-            window.addEventListener('load', () => {{document.getElementById("{self.html_id}").on((values)=>{js});
-            document.getElementById("{self.html_id}").format((values)=>{export});}} );
-        </script>
-        """
-
-    def change_event(self, js: str) -> None:
-        """
-        Met à jour l'évènement de changement de valeur du multi-select
-
-        CallBack JS : (values) => {/*actions à effectuer*/}
-
-        Sera retranscrit dans l'HTML comme :
-
-        document.getElementById(%self.id%).on((values)=>{%self.js%})
-
-        Exemple d'utilisation :
-
-        js : "console.log(values)"
-        """
-        self.js: str = js
-
-    def export_format(self, js: str) -> None:
-        """
-        Met à jour le format de retour de valeur du multi-select
-
-        CallBack JS : (values) => {/*actions à effectuer*/}
-
-        Sera retranscrit dans l'HTML comme :
-
-        document.getElementById(%self.id%).format((values)=>{%self.js%})
-
-        Exemple d'utilisation :
-
-        js : "return values.map(v=> 'val:'+v)"
-        """
-        self.export: str = js
-
-
 # Types de modules
 class ModuleType(IntEnum):
     """Code des types de module."""
diff --git a/app/static/js/multi-select.js b/app/static/js/multi-select.js
index e10194ad..178586f8 100644
--- a/app/static/js/multi-select.js
+++ b/app/static/js/multi-select.js
@@ -76,18 +76,28 @@ class MultiSelect extends HTMLElement {
                       position: absolute;
                       background-color: #fff;
                       min-width: 200px;
-                      max-height: 200px;
-                      overflow-y: auto;
                       box-shadow: 0px 8px 16px 0px rgba(0,0,0,0.2);
                       z-index: 1;
                     }
                     .dropdown-content .optgroup {
-                      padding: 10px;
+                      padding: 4px 8px;
                       width: 100%;
                     }
                     .dropdown-content .optgroup div {
                       font-weight: bold;
                     }
+                    .dropdown-button::after{
+                      content: "";
+                      display: inline-block;
+                      width: 0;
+                      height: 0;
+                      margin-left: 4px;
+                      vertical-align: middle;
+                      border-top: 4px dashed;
+                      border-right: 4px solid transparent;
+                      border-left: 4px solid transparent;
+                    }
+
                     .dropdown-content .option {
                       display: flex;
                       align-items: center;
@@ -252,11 +262,6 @@ class MultiSelect extends HTMLElement {
     } else {
       btn.textContent = `${checkedBoxes.length} sélections`;
     }
-
-    btn.textContent += " ⮛";
-
-    this._values(values);
-
     this.dispatchEvent(new Event("change"));
   }
 
@@ -280,6 +285,7 @@ class MultiSelect extends HTMLElement {
       });
 
       this._internals.setFormValue(this._values());
+      this._updateSelect();
     }
   }