Fix

Author: RobiNN1

config.dist.php

@@ -61,7 +61,7 @@
             //'separator' => ':', // Separator for tree view (optional)
         ],
     ],
-    //'apcu-separator' => ':', // Separator for tree view (optional)
+    //'apcuseparator' => ':', // Separator for tree view (optional)
     // Example of authentication with http auth.
     /*'auth'           => static function (): void {
         $username = 'admin';

src/Dashboards/APCu/APCuTrait.php

@@ -244,7 +244,7 @@ public function keysTableView(array $keys): array {
      * @return array<int, array<string, string|int>>
      */
     public function keysTreeView(array $keys): array {
-        $separator = Config::get('apcu-separator', ':');
+        $separator = Config::get('apcuseparator', ':');
         $this->template->addGlobal('separator', $separator);
 
         $tree = [];