diff --git a/participation/admin.py b/participation/admin.py
index 86ad076..bca9d07 100644
--- a/participation/admin.py
+++ b/participation/admin.py
@@ -1,7 +1,9 @@
 # Copyright (C) 2020 by Animath
 # SPDX-License-Identifier: GPL-3.0-or-later
 
+from django.conf import settings
 from django.contrib import admin
+from django.http import HttpRequest
 from django.utils.translation import gettext_lazy as _
 
 from .models import Note, Participation, Passage, Pool, Solution, Team, Tournament, Tweak, WrittenReview
@@ -51,9 +53,14 @@ class PassageInline(admin.TabularInline):
     model = Passage
     extra = 0
     ordering = ('position',)
-    autocomplete_fields = ('reporter', 'opponent', 'reviewer', 'observer',)
     show_change_link = True
 
+    def get_autocomplete_fields(self, request: HttpRequest) -> tuple[str]:
+        fields = ('reporter', 'opponent', 'reviewer',)
+        if settings.HAS_OBSERVER:
+            fields += ('observer',)
+        return fields
+
 
 class NoteInline(admin.TabularInline):
     model = Note
@@ -113,12 +120,9 @@ class PoolAdmin(admin.ModelAdmin):
 
 @admin.register(Passage)
 class PassageAdmin(admin.ModelAdmin):
-    list_display = ('__str__', 'reporter_trigram', 'solution_number', 'opponent_trigram', 'reviewer_trigram',
-                    'observer_trigram', 'pool_abbr', 'position', 'tournament')
     list_filter = ('pool__tournament', 'pool__round', 'pool__letter', 'solution_number',)
     search_fields = ('pool__participations__team__name', 'pool__participations__team__trigram',)
     ordering = ('pool__tournament', 'pool__round', 'pool__letter', 'position',)
-    autocomplete_fields = ('pool', 'reporter', 'opponent', 'reviewer', 'observer',)
     inlines = (NoteInline,)
 
     @admin.display(description=_("reporter"), ordering='reporter__team__trigram')
@@ -135,7 +139,7 @@ class PassageAdmin(admin.ModelAdmin):
 
     @admin.display(description=_("observer"), ordering='observer__team__trigram')
     def observer_trigram(self, record: Passage):
-        return record.observer.team.trigram
+        return record.observer.team.trigram if record.observer else None
 
     @admin.display(description=_("pool"), ordering='pool__letter')
     def pool_abbr(self, record):
@@ -145,15 +149,23 @@ class PassageAdmin(admin.ModelAdmin):
     def tournament(self, record: Passage):
         return record.pool.tournament
 
+    def get_list_display(self, request: HttpRequest) -> tuple[str]:
+        if settings.HAS_OBSERVER:
+            return ('__str__', 'reporter_trigram', 'solution_number', 'opponent_trigram',
+                    'reviewer_trigram', 'observer_trigram', 'pool_abbr', 'position', 'tournament')
+        else:
+            return ('__str__', 'reporter_trigram', 'solution_number', 'opponent_trigram',
+                    'reviewer_trigram', 'pool_abbr', 'position', 'tournament')
+
+    def get_autocomplete_fields(self, request: HttpRequest) -> tuple[str]:
+        fields = ('pool', 'reporter', 'opponent', 'reviewer',)
+        if settings.HAS_OBSERVER:
+            fields += ('observer',)
+        return fields
+
 
 @admin.register(Note)
 class NoteAdmin(admin.ModelAdmin):
-    list_display = ('passage', 'pool', 'jury', 'reporter_writing', 'reporter_oral',
-                    'opponent_writing', 'opponent_oral', 'reviewer_writing', 'reviewer_oral',
-                    'observer_writing', 'observer_oral',)
-    list_filter = ('passage__pool__letter', 'passage__solution_number', 'jury',
-                   'reporter_writing', 'reporter_oral', 'opponent_writing', 'opponent_oral',
-                   'reviewer_writing', 'reviewer_oral', 'observer_writing', 'observer_oral')
     search_fields = ('jury__user__last_name', 'jury__user__first_name', 'passage__reporter__team__trigram',)
     autocomplete_fields = ('jury', 'passage',)
 
@@ -161,6 +173,21 @@ class NoteAdmin(admin.ModelAdmin):
     def pool(self, record):
         return record.passage.pool.short_name
 
+    def get_list_display(self, request: HttpRequest) -> tuple[str]:
+        fields = ('passage', 'pool', 'jury', 'reporter_writing', 'reporter_oral',
+                  'opponent_writing', 'opponent_oral', 'reviewer_writing', 'reviewer_oral',)
+        if settings.HAS_OBSERVER:
+            fields += ('observer_writing', 'observer_oral',)
+        return fields
+
+    def get_list_filter(self, request: HttpRequest) -> tuple[str]:
+        fields = ('passage__pool__letter', 'passage__solution_number', 'jury',
+                  'reporter_writing', 'reporter_oral', 'opponent_writing', 'opponent_oral',
+                  'reviewer_writing', 'reviewer_oral',)
+        if settings.HAS_OBSERVER:
+            fields += ('observer_writing', 'observer_oral',)
+        return fields
+
 
 @admin.register(Solution)
 class SolutionAdmin(admin.ModelAdmin):
diff --git a/participation/forms.py b/participation/forms.py
index 75c60a3..c677db9 100644
--- a/participation/forms.py
+++ b/participation/forms.py
@@ -7,6 +7,7 @@ import re
 from crispy_forms.helper import FormHelper
 from crispy_forms.layout import Div, Field, HTML, Layout, Submit
 from django import forms
+from django.conf import settings
 from django.contrib.auth.models import User
 from django.core.exceptions import ValidationError
 from django.core.validators import FileExtensionValidator
@@ -14,7 +15,6 @@ from django.utils.translation import gettext_lazy as _
 import pandas
 from pypdf import PdfReader
 from registration.models import VolunteerRegistration
-from tfjm import settings
 
 from .models import Note, Participation, Passage, Pool, Solution, Team, Tournament, WrittenReview
 
@@ -405,6 +405,12 @@ class WrittenReviewForm(forms.ModelForm):
 
 
 class NoteForm(forms.ModelForm):
+    def __init__(self, *args, **kwargs):
+        super().__init__(*args, **kwargs)
+        if not settings.HAS_OBSERVER:
+            del self.fields['observer_writing']
+            del self.fields['observer_oral']
+
     class Meta:
         model = Note
         fields = ('reporter_writing', 'reporter_oral', 'opponent_writing',
diff --git a/participation/tables.py b/participation/tables.py
index a535d50..fd5f655 100644
--- a/participation/tables.py
+++ b/participation/tables.py
@@ -1,6 +1,7 @@
 # Copyright (C) 2020 by Animath
 # SPDX-License-Identifier: GPL-3.0-or-later
 
+from django.conf import settings
 from django.utils import formats
 from django.utils.safestring import mark_safe
 from django.utils.text import format_lazy
@@ -106,7 +107,10 @@ class PoolTable(tables.Table):
 
 
 class PassageTable(tables.Table):
-    # FIXME Ne pas afficher l'équipe observatrice si non nécessaire
+    def __init__(self, *args, **kwargs):
+        super().__init__(*args, **kwargs)
+        if not settings.HAS_OBSERVER:
+            del self.columns['observer']
 
     reporter = tables.LinkColumn(
         "participation:passage_detail",
@@ -135,6 +139,12 @@ class PassageTable(tables.Table):
 
 
 class NoteTable(tables.Table):
+    def __init__(self, *args, **kwargs):
+        super().__init__(*args, **kwargs)
+        if not settings.HAS_OBSERVER:
+            del self.columns['observer_writing']
+            del self.columns['observer_oral']
+
     jury = tables.Column(
         attrs={
             "td": {