Create a zen.php file under your /config directory with the following options available to you. You can also use multi-environment options to change these per environment.
The below shows the defaults already used by Zen, so you don't need to add these options unless you want to modify the values.
<?php
return [
'*' => [
'pluginName' => 'Zen',
]
];
pluginName - If you wish to customise the plugin name.You can also manage configuration settings through the Control Panel by visiting Settings → Zen.