Dequeue the JavaScript files from WooCommerce Square on all pages except the checkout page.

functions.php

<?php // do not copy this line

/**
 * Note: This has not been tested on a live site and is to be used at your own risk.
 *
 * This will dequeue the JavaScript files from WooCommerce Square on all pages except the checkout page.
 */
add_action( 'wp_enqueue_scripts', 'dequeue_wc_square_js_scripts_20200713', 999 );
function dequeue_wc_square_js_scripts_20200713() {
	// Not needed in admin, and we want to keep in checkout
	if ( is_admin() || is_checkout() ) { 
		return ;
	}

	// Remove the scripts from the queue. 
	wp_dequeue_script( 'wc-square' );
	wp_dequeue_script( 'wc-square-payment-form' );
}