Problem:

What I would need is a condition that avoid the code running in the View blocks preview only but I did not find any until now.

Solution:

You can use function WP_Screen::is_block_editor() to check if it is the block editor is loading on the current screen, see WP document:

Relevant Documentation:

https://developer.wordpress.org/reference/classes/wp_screen/is_block_editor/

Problem:

The issue here here is that the user wanted to format the output from their number field with a comma for every thousand.

Solution:
This is not something that can be done natively with our Toolset plugins and as such you will need to use a little bit of custom code to format the numbers.

I've written a simple custom shortcode below to format the numbers for you.

// Add Shortcode
function wp_format_number( $atts ) {
 
    // Attributes
    $atts = shortcode_atts(
        array(
            'number' => '',
        ),
        $atts
    );
 
    return number_format($atts['number'],0,'.',',');
 
}
add_shortcode( 'wp_format_number', 'wp_format_number' );

Add it to your Toolset Custom Code section in Toolset->Settings->Custom Code and activate it.

Then you can simply use the shortcode like this [wp_format_number number='[wpv-items-count]']

Relevant Documentation: