diff --git a/autofit/graphical/declarative/collection.py b/autofit/graphical/declarative/collection.py
index f8ba1f291..c194c9f2d 100644
--- a/autofit/graphical/declarative/collection.py
+++ b/autofit/graphical/declarative/collection.py
@@ -302,28 +302,50 @@ def save_results(self, paths: AbstractPaths, result):
         """
         self._for_each_analysis("save_results", paths, result)
 
+    def _factors_grouped_by_visualizer(self, instance):
+        """
+        ``(factors, instances)`` pairs grouped by each factor's analysis ``Visualizer``
+        class, order preserved within groups.
+
+        A combined visualization can only draw analyses its ``Visualizer`` understands,
+        so a mixed-dataset graph (e.g. imaging + weak-lensing factors) must dispatch one
+        combined call per visualizer type rather than routing every factor into the lead
+        factor's visualizer. A homogeneous graph produces exactly one group, making the
+        dispatch identical to the previous lead-factor-takes-all behaviour.
+        """
+        groups = {}
+        for factor, single_instance in zip(self.model_factors, instance):
+            analysis = getattr(factor, "analysis", factor)
+            key = getattr(type(analysis), "Visualizer", type(analysis))
+            groups.setdefault(key, ([], []))
+            groups[key][0].append(factor)
+            groups[key][1].append(single_instance)
+        return groups.values()
+
     def visualize_combined(
         self,
         instance,
         paths: AbstractPaths,
         during_analysis,
     ):
-        self.model_factors[0].visualize_combined(
-            self.model_factors,
-            paths,
-            instance,
-            during_analysis=during_analysis,
-        )
+        for factors, instances in self._factors_grouped_by_visualizer(instance):
+            factors[0].visualize_combined(
+                factors,
+                paths,
+                instances,
+                during_analysis=during_analysis,
+            )
 
     def perform_quick_update(self, paths, instance):
 
         try:
-            self.model_factors[0].visualize_combined(
-                analyses=self.model_factors,
-                paths=paths,
-                instance=instance,
-                during_analysis=True,
-                quick_update=True,
-            )
+            for factors, instances in self._factors_grouped_by_visualizer(instance):
+                factors[0].visualize_combined(
+                    analyses=factors,
+                    paths=paths,
+                    instance=instances,
+                    during_analysis=True,
+                    quick_update=True,
+                )
         except Exception as e:
             pass
\ No newline at end of file
diff --git a/test_autofit/graphical/test_visualize_combined_dispatch.py b/test_autofit/graphical/test_visualize_combined_dispatch.py
new file mode 100644
index 000000000..f9e4bbed8
--- /dev/null
+++ b/test_autofit/graphical/test_visualize_combined_dispatch.py
@@ -0,0 +1,67 @@
+import autofit as af
+
+
+class _RecordingVisualizerA(af.Visualizer):
+    calls = []
+
+    @staticmethod
+    def visualize_combined(analyses, paths, instance, during_analysis, quick_update=False):
+        _RecordingVisualizerA.calls.append((list(analyses), list(instance)))
+
+
+class _RecordingVisualizerB(af.Visualizer):
+    calls = []
+
+    @staticmethod
+    def visualize_combined(analyses, paths, instance, during_analysis, quick_update=False):
+        _RecordingVisualizerB.calls.append((list(analyses), list(instance)))
+
+
+class _AnalysisA(af.mock.MockAnalysis):
+    Visualizer = _RecordingVisualizerA
+
+
+class _AnalysisB(af.mock.MockAnalysis):
+    Visualizer = _RecordingVisualizerB
+
+
+def _factor_graph(analyses):
+    model = af.Model(af.ex.Gaussian)
+    factors = [af.AnalysisFactor(prior_model=model, analysis=analysis) for analysis in analyses]
+    return af.FactorGraphModel(*factors)
+
+
+def test__homogeneous_graph__single_combined_call_with_all_factors():
+    _RecordingVisualizerA.calls = []
+
+    analyses = [_AnalysisA(), _AnalysisA(), _AnalysisA()]
+    graph = _factor_graph(analyses)
+
+    graph.visualize_combined(instance=["i0", "i1", "i2"], paths=None, during_analysis=True)
+
+    assert len(_RecordingVisualizerA.calls) == 1
+    called_analyses, called_instances = _RecordingVisualizerA.calls[0]
+    assert called_analyses == analyses
+    assert called_instances == ["i0", "i1", "i2"]
+
+
+def test__mixed_graph__one_combined_call_per_visualizer_type():
+    _RecordingVisualizerA.calls = []
+    _RecordingVisualizerB.calls = []
+
+    analysis_a0, analysis_b, analysis_a1 = _AnalysisA(), _AnalysisB(), _AnalysisA()
+    graph = _factor_graph([analysis_a0, analysis_b, analysis_a1])
+
+    graph.visualize_combined(instance=["a0", "b0", "a1"], paths=None, during_analysis=True)
+
+    # A-group: both A analyses, order preserved, with their matching instances.
+    assert len(_RecordingVisualizerA.calls) == 1
+    called_analyses, called_instances = _RecordingVisualizerA.calls[0]
+    assert called_analyses == [analysis_a0, analysis_a1]
+    assert called_instances == ["a0", "a1"]
+
+    # B-group: the lone B analysis with its own instance.
+    assert len(_RecordingVisualizerB.calls) == 1
+    called_analyses, called_instances = _RecordingVisualizerB.calls[0]
+    assert called_analyses == [analysis_b]
+    assert called_instances == ["b0"]