diff --git a/README.md b/README.md
index 7fa52390..229a85b8 100644
--- a/README.md
+++ b/README.md
@@ -6,13 +6,14 @@ GUI Extension for Mecha
 Release Notes
 -------------
 
-### master
+### 2.4.0
 
  - Removed `$lot` hook parameter and store the form data to `$_['form']` property, for easy form data manipulation during CRUD process.
  - Fixed bug where creating a new page does not populate the `time` data automatically.
  - Changed `#blob:{code}` language string into a more readable language string as the default language string for every blob response code.
  - Updated [Tag Picker](https://github.com/taufik-nurrohman/tag-picker) to version 3.0.12.
  - Moved `type` and `x` state data to a separated file, stored in `.\lot\x\panel\state` folder.
+ - Added ability to set custom panel definition through `.\lot\layout\index\panel.php` file.
 
 ### 2.3.2
 
diff --git a/panel/engine/r/route.php b/panel/engine/r/route.php
index f8fe2a6f..e3d2b912 100644
--- a/panel/engine/r/route.php
+++ b/panel/engine/r/route.php
@@ -86,12 +86,18 @@ function route() {
         // Update data
         $_ = $GLOBALS['_'];
     }
+    // Load panel definition from a file stored in `.\lot\x\*\index\panel.php`
     foreach ($GLOBALS['X'][1] as $v) {
         \is_file($v = \Path::F($v) . \DS . 'panel.php') && (function($v) {
             extract($GLOBALS, \EXTR_SKIP);
             require $v;
         })($v);
     }
+    // Load panel definition from a file stored in `.\lot\layout\index\panel.php`
+    \is_file($v = \LOT . \DS . 'layout' . \DS . 'index' . \DS . 'panel.php') && (function($v) {
+        extract($GLOBALS, \EXTR_SKIP);
+        require $v;
+    })($v);
     // Update data
     $_ = $GLOBALS['_'];
     // Define lot with no filter
diff --git a/panel/engine/r/task/g.php b/panel/engine/r/task/g.php
index 32f633f8..3bb37044 100644
--- a/panel/engine/r/task/g.php
+++ b/panel/engine/r/task/g.php
@@ -166,11 +166,11 @@ function page($_) {
         unset($_['form']['page']['name'], $_['form']['page']['x']);
         $page = [];
         $p = (array) ($state->x->page->page ?? []);
-        // Remove array item(s) with `null` value
-        $nully = function($v) use(&$nully) {
+        // Remove array item(s) with empty value
+        $drop = function($v) use(&$drop) {
             foreach ($v as $kk => $vv) {
                 if (\is_array($vv) && !empty($vv)) {
-                    if ($vv = $nully($vv)) {
+                    if ($vv = $drop($vv)) {
                         $v[$kk] = $vv;
                     } else {
                         unset($v[$kk]);
@@ -194,7 +194,7 @@ function page($_) {
                 continue;
             }
             if (\is_array($v)) {
-                if ($v = $nully(\array_replace_recursive($page[$k] ?? [], $v))) {
+                if ($v = $drop(\array_replace_recursive($page[$k] ?? [], $v))) {
                     $page[$k] = $v;
                 }
             } else {
@@ -253,11 +253,11 @@ function state($_) {
         'token' => false,
         'trash' => false
     ]) . $url->hash;
-    // Remove array item(s) with `null` value
-    $nully = function($v) use(&$nully) {
+    // Remove array item(s) with empty value
+    $drop = function($v) use(&$drop) {
         foreach ($v as $kk => $vv) {
             if (\is_array($vv) && !empty($vv)) {
-                if ($vv = $nully($vv)) {
+                if ($vv = $drop($vv)) {
                     $v[$kk] = $vv;
                 } else {
                     unset($v[$kk]);
@@ -276,7 +276,7 @@ function state($_) {
         if (\is_file($f = \LOT . \DS . \trim(\strtr($_['form']['path'] ?? $_['path'], '/', \DS), \DS))) {
             $_['f'] = $f = \realpath($f);
             $v = \array_replace_recursive((array) require $f, $_['form']['state'] ?? []);
-            $v = $nully($v);
+            $v = $drop($v);
             $_['form']['file']['content'] = $_POST['file']['content'] = '<?php return ' . \z($v) . ';';
             $_ = file($_); // Move to `file`
         }
diff --git a/panel/engine/r/task/s.php b/panel/engine/r/task/s.php
index 8cbfd09c..5f5306b6 100644
--- a/panel/engine/r/task/s.php
+++ b/panel/engine/r/task/s.php
@@ -218,11 +218,11 @@ function page($_) {
         unset($_['form']['page']['name'], $_['form']['page']['x']);
         $page = [];
         $p = (array) ($state->x->page->page ?? []);
-        // Remove array item(s) with `null` value
-        $nully = function($v) use(&$nully) {
+        // Remove array item(s) with empty value
+        $drop = function($v) use(&$drop) {
             foreach ($v as $kk => $vv) {
                 if (\is_array($vv) && !empty($vv)) {
-                    if ($vv = $nully($vv)) {
+                    if ($vv = $drop($vv)) {
                         $v[$kk] = $vv;
                     } else {
                         unset($v[$kk]);
@@ -246,7 +246,7 @@ function page($_) {
                 continue;
             }
             if (\is_array($v)) {
-                if ($v = $nully(\array_replace_recursive($page[$k] ?? [], $v))) {
+                if ($v = $drop(\array_replace_recursive($page[$k] ?? [], $v))) {
                     $page[$k] = $v;
                 }
             } else {