Drupal Menu not Saving Due to max_input_vars

Add below line to the php.ini or .user.ini which is located in site root folder, if this file is not available you care create and add this line and upload it to the server.
------------------------------------------
max_input_vars = 2000
------------------------------------------

OR

Add these lines to your .htaccess file:

php_value post_max_size = 20000M
php_value upload_max_filesize = 20000M
php_value max_execution_time = 30000
php_value max_input_time = 60000
php_value memory_limit = 8000M
php_value max_input_vars = 8000
php_value suhosin.post.max_vars = 8000
php_value suhosin.request.max_vars = 8000