Maximum input vars limit the number of input variables which affect menus and theme options in the Aardvark theme. To increase the Maximum input vars do the following:

Method 1: Increasing Max Input Vars In .htaccess File

Step 1: Locate the .htaccess file inside the root of your WordPress installation (located in the same folder as your /wp-content/ and /wp-admin/ directories) using an FTP client or file manager in your web hosting control panel (if you can’t find it see why you can’t find the .htaccess file and how to find it or if you’re not sure how to do this, ignore the steps below and contact your web host who can do this for you).

Step 2: Paste this code in .htaccess file:

php_value max_input_vars 1000
php_value suhosin.get.max_vars 1000
php_value suhosin.post.max_vars 1000
php_value suhosin.request.max_vars 1000

Step 3: Now save the file.

Method 2: Increasing Max Input Vars In php.ini File

Step 1: Locate the php.ini file inside the /wp-admin directory using an FTP client or file manager in your web hosting control panel (if you’re not sure how to do this, ignore the steps below and contact your web host who can do this for you).

Step 2: Paste this code in  your .php.ini file:

max_input_vars = 1000
suhosin.get.max_vars = 1000
suhosin.post.max_vars = 1000
suhosin.request.max_vars = 1000

Step 3: Now save the file.

Step 4: If you still have issues, look for this file in your root directory and make the same changes.