hooks – wp_footer content material showing in admin space

What’s occurring right here is your echo is executing earlier than the rest.

Attempt utilizing the wp_enqueue_scripts hook as an alternative of wp_footer, and as an alternative of echo you’ll wp_enqueue_script().

<?php
// Utilizing a distinct hook:
add_action( 'wp_enqueue_scripts', 'wpse_411187_script' );

operate wpse_411187_script() {
    wp_enqueue_script(
        // "Deal with" - a novel title to your script
        'xyz-footer-print',
        // Path to the JS file - modify as wanted
        plugins_url( 'construct/xyz-footer-print.js', dirname( __DIR__ ) ),
        // Array of dependencies
        '',
        // Model quantity
        '1.0',
        // True to position the script the footer
        true
    );
}
?>