diff --git a/search_app.py b/search_app.py
index eb056f0..fb30dfa 100644
--- a/search_app.py
+++ b/search_app.py
@@ -745,7 +745,7 @@ def create_app(config: AppConfig = CONFIG) -> Flask:
         }
 
     def build_full_graph_payload(
-        max_nodes: int, *, highlight_id: Optional[str] = None
+        max_nodes: Optional[int], *, highlight_id: Optional[str] = None
     ) -> Dict[str, Any]:
         """
         Attempt to render the entire reference graph by gathering every video that
@@ -776,7 +776,8 @@ def create_app(config: AppConfig = CONFIG) -> Flask:
         nodes: Dict[str, Dict[str, Any]] = {}
         links: List[Dict[str, Any]] = []
         link_seen: Set[Tuple[str, str, str]] = set()
-        batch_size = min(500, max(50, max_nodes * 2))
+        node_limit = max_nodes if max_nodes and max_nodes > 0 else None
+        batch_size = 500 if node_limit is None else min(500, max(50, node_limit * 2))
         truncated = False
 
         def ensure_node(node_id: Optional[str], doc: Optional[Dict[str, Any]] = None) -> bool:
@@ -799,7 +800,7 @@ def create_app(config: AppConfig = CONFIG) -> Flask:
                     if not existing.get("date") and doc.get("date"):
                         existing["date"] = doc.get("date")
                 return True
-            if len(nodes) >= max_nodes:
+            if node_limit is not None and len(nodes) >= node_limit:
                 return False
             channel_name = None
             channel_id = None
@@ -836,7 +837,7 @@ def create_app(config: AppConfig = CONFIG) -> Flask:
                 if not hits:
                     break
                 for hit in hits:
-                    if len(nodes) >= max_nodes:
+                    if node_limit is not None and len(nodes) >= node_limit:
                         truncated = True
                         stop_fetch = True
                         break
@@ -996,14 +997,17 @@ def create_app(config: AppConfig = CONFIG) -> Flask:
             depth = 1
         depth = max(0, min(depth, 3))
 
-        try:
-            max_nodes = int(request.args.get("max_nodes", "200"))
-        except ValueError:
-            max_nodes = 200
-        max_nodes = max(10, min(max_nodes, 800 if full_graph else 400))
+        if full_graph:
+            max_nodes = None
+        else:
+            try:
+                max_nodes = int(request.args.get("max_nodes", "200"))
+            except ValueError:
+                max_nodes = 200
+            max_nodes = max(10, min(max_nodes, 400))
 
         if full_graph:
-            payload = build_full_graph_payload(max_nodes, highlight_id=video_id or None)
+            payload = build_full_graph_payload(None, highlight_id=video_id or None)
         else:
             payload = build_graph_payload(video_id, depth, max_nodes)
             if not payload["nodes"]:
@@ -1011,7 +1015,9 @@ def create_app(config: AppConfig = CONFIG) -> Flask:
                     jsonify({"error": f"Video '{video_id}' was not found in the index."}),
                     404,
                 )
-        payload["meta"]["max_nodes"] = max_nodes
+        payload["meta"]["max_nodes"] = (
+            len(payload["nodes"]) if full_graph else max_nodes
+        )
         return jsonify(payload)
 
     @app.route("/api/years")
diff --git a/static/graph.js b/static/graph.js
index c817c11..daf1c24 100644
--- a/static/graph.js
+++ b/static/graph.js
@@ -135,6 +135,7 @@
   let currentMaxNodes = sanitizeMaxNodes(maxNodesInput.value);
   let currentSimulation = null;
   let currentFullGraph = false;
+  let previousMaxNodesValue = maxNodesInput ? maxNodesInput.value : "200";
 
   function setStatus(message, isError = false) {
     if (!statusEl) return;
@@ -165,6 +166,18 @@
     if (depthInput) {
       depthInput.disabled = enabled;
     }
+    if (maxNodesInput) {
+      if (enabled) {
+        previousMaxNodesValue = maxNodesInput.value || previousMaxNodesValue || "200";
+        maxNodesInput.value = "0";
+        maxNodesInput.disabled = true;
+      } else {
+        if (maxNodesInput.disabled) {
+          maxNodesInput.value = previousMaxNodesValue || "200";
+        }
+        maxNodesInput.disabled = false;
+      }
+    }
     if (videoInput) {
       if (enabled) {
         videoInput.removeAttribute("required");
@@ -181,10 +194,11 @@
     }
     if (fullGraphMode) {
       params.set("full_graph", "1");
+      params.set("max_nodes", "0");
     } else {
       params.set("depth", String(depth));
+      params.set("max_nodes", String(maxNodes));
     }
-    params.set("max_nodes", String(maxNodes));
     const response = await fetch(`/api/graph?${params.toString()}`);
     if (!response.ok) {
       const errorPayload = await response.json().catch(() => ({}));
@@ -445,8 +459,8 @@
       setStatus("Please enter a video ID.", true);
       return;
     }
-    const safeDepth = wantsFull ? 0 : sanitizeDepth(depth);
-    const safeMaxNodes = sanitizeMaxNodes(maxNodes);
+    const safeDepth = wantsFull ? currentDepth || 1 : sanitizeDepth(depth);
+    const safeMaxNodes = wantsFull ? 0 : sanitizeMaxNodes(maxNodes);
 
     if (updateInputs) {
       videoInput.value = sanitizedId;
@@ -630,11 +644,12 @@
     if (fullGraphMode) {
       next.searchParams.set("full_graph", "1");
       next.searchParams.delete("depth");
+      next.searchParams.set("max_nodes", "0");
     } else {
       next.searchParams.set("depth", String(depth));
       next.searchParams.delete("full_graph");
+      next.searchParams.set("max_nodes", String(maxNodes));
     }
-    next.searchParams.set("max_nodes", String(maxNodes));
     if (labelSize && labelSize !== "normal") {
       next.searchParams.set("label_size", labelSize);
     } else {
@@ -647,7 +662,11 @@
     const params = new URLSearchParams(window.location.search);
     const videoId = sanitizeId(params.get("video_id"));
     const depth = sanitizeDepth(params.get("depth") || "");
-    const maxNodes = sanitizeMaxNodes(params.get("max_nodes") || "");
+    const rawMaxNodes = params.get("max_nodes");
+    let maxNodes = sanitizeMaxNodes(rawMaxNodes || "");
+    if (rawMaxNodes && rawMaxNodes.trim() === "0") {
+      maxNodes = 0;
+    }
     const labelSizeParam = params.get("label_size");
     const fullGraphParam = params.get("full_graph");
     const viewFull =
@@ -656,7 +675,7 @@
       videoInput.value = videoId;
     }
     depthInput.value = String(depth);
-    maxNodesInput.value = String(maxNodes);
+    maxNodesInput.value = String(viewFull ? 0 : maxNodes);
     if (fullGraphToggle) {
       fullGraphToggle.checked = !!viewFull;
     }