Custom footer widget width size filters not working

Hello there,

I just followed the guidelines given in here to get different widths for footer widgets but for some reason it's not working for me, even after clearing cache. I'm using GP 3.0.2 and GP Premium 1.12.2. Please see the private information area for the development site link. Here's the snippet I've added using Code Snippets plugin:

add_filter( 'generate_footer_widget_1_width', function() {
    return '10';
} );
add_filter( 'generate_footer_widget_2_width', function() {
    return '10';
} );
add_filter( 'generate_footer_widget_3_width', function() {
    return '80';
} );

Many thanks in advance!

Pradeep