diff --git a/PYAS.py b/PYAS.py
index 7002f06..11d86c3 100644
--- a/PYAS.py
+++ b/PYAS.py
@@ -479,7 +479,9 @@ class MainWindow_Controller(QMainWindow):
         self.pyas_config[name] = bool(checked)
         if name == "sensitive_switch":
             if checked:
-                if self.send_message("增強模式可能會誤報檔案，您確定要啟用嗎?", "quest", True):
+                if not self.isVisible():
+                    self.save_config(self.file_config, self.pyas_config)
+                elif self.send_message("增強模式可能會誤報檔案，您確定要啟用嗎?", "quest", True):
                     self.save_config(self.file_config, self.pyas_config)
                 else:
                     self.pyas_config[name] = False
diff --git a/PYAS_Engine.py b/PYAS_Engine.py
index 3aa6a7e..693eae1 100644
--- a/PYAS_Engine.py
+++ b/PYAS_Engine.py
@@ -538,10 +538,12 @@ class pe_scanner:
         pe = None
         try:
             fsize = os.path.getsize(file_path)
-            if fsize == 0 or fsize > 268435456:
+            if fsize == 0 or fsize > 512 * 1024 * 1024:
                 return None
+
             with open(file_path, "rb") as f:
                 file_bytes = f.read()
+
             pe = pefile.PE(data=file_bytes, fast_load=True)
             fts['TrustSigned'] = 1 if self.signer.sign_verify(file_path) else 0
             fh = pe.FILE_HEADER