We only recommend doing this if you have little traffic and generating reports for your Matomo is fast. Generating the reports on demand when you view them will make your Matomo slow otherwise. If for some reason you want to enable the browser archiving, for example because you are a developer or because you are having other issues, you can enable this feature by adding the following line to your wp-config.php:

define('MATOMO_TRIGGER_BROWSER_ARCHIVING', true);
Previous FAQ: Matomo for WordPress is not showing any statistics / reports, how do I fix it?