docs/data/reusables/apps/optional_feature_activation.md

4. In the left sidebar, click {% if currentVersion ver_lt "enterprise-server@3.1" %} Beta {% else %} Optional {% endif %} Features. {% if currentVersion ver_lt "enterprise-server@3.1" %} {% else %} {% endif %}
5. Next to the {% if currentVersion ver_lt "enterprise-server@3.1" %} beta {% else %} optional {% endif %} feature you want to enable for your app, click Opt-in.