Issue : To change the max_input_value to 3000.
Reason : Some wordpress file doesn't configure with required compatibilities.
Which may cause issue while saving the settings in wordpress themes.
Solution : Go to your server CPanel and enter into the theme directories >>>
Wp-admin >>> php.ini
edit this file and search for max_input_vars,
If you don't find it then paste this syntax.
Syntax : max_input_vars=3000;
Save the file and do a hard refresh with Ctrl+f5..... Now you good to go :)
Note : When you start searching php.ini file in directories you get this file on
there root directory.... where you see folders named wp-admin,wp-content etc.
if you edit this file you'll won't get a result !!