Filter: curatewp_section_object_query_args

functions.php

<?php

add_filter( 'curatewp_section_object_query_args', function( $query_args, $section ) {
    
    // Alter the query args for a specific section.
    if ( 'your-section-name' === $section->post_name ) {
        $query_args[ 'category__no_in' ] = [ 2, 54 ];
    }
    
    // Pass back the altered query arguments.
    return $query_args;
}, 10, 2 );