give-wp-plugin-remove-thousand-separator.php

// Put functions.php

add_filter('give_format_amount', 'give_remove_thousands_seperator');

function give_remove_thousands_seperator($amount, $decimals = true) {

    $thousands_sep = '';
    $decimal_sep   = give_get_option( 'decimal_separator', '.' );

    if ( empty( $amount ) ) {
        $amount = 0;
    } else {
        // Sanitize amount before formatting.
        $amount = give_sanitize_amount( $amount );
    }

    $decimals = $decimals ? give_get_price_decimals() : 0;

    $formatted = number_format( $amount, $decimals, $decimal_sep, $thousands_sep );

    return $formatted;
}

add_filter('give_global_script_vars', 'give_remove_thousands_js_autoformatting');

function give_remove_thousands_js_autoformatting($args) {

    $args['thousands_separator'] = '';
    return $args;
}