Hello,

Redux plugin checks the folder to have permissions 777. But if it works with 770 correctly for you then you can ignore the notice.

1. You can disable default sort by price and ordering widgets adding this code to the functions.php file in the child theme

add_filter( 'basel_use_custom_price_widget', '__return_false', 10 );
add_filter( 'basel_use_custom_order_widget', '__return_false', 10 );

.

Here is a video tutorial that will help you create variable products with variations swatches and AJAX filters https://www.youtube.com/watch?v=gp3SMkKvUvs

2. Unfortunately, there is no such feature in Visual Composer plugin.

Regards