Use Profile in your settings to choose the language of Zeno's interface and the language of its responses. These are separate preferences.
Set the Interface Language
Open Profile in your settings.
Under Preferences, open Interface language.
Select the language you want to use for Zeno's interface.
This preference concerns the interface, such as its menus and controls. Set Response language separately to choose the language of Zeno's answers.
Set the Response Language
Open Profile in your settings.
Under Preferences, open Response language.
Select the language you want Zeno to use in its responses.
Changes apply immediately; there is no separate save step on this page.
Choosing a response language is different from asking Zeno to translate a complete document. If you need a translation, state that explicitly in your request and review the result against the original.
Use a Different Language for One Task
If an answer uses an unexpected language, check Response language rather than only Interface language. State the required language in your next instruction if the task needs a different one.