Buffer size and sample rate can be set via the Focusrite Device Settings panel:
Please note that the sample rate selected here will be the only option that appears in Control Panel > Sound.
You can find Focusrite Device Settings by searching in the Windows search bar, or via the Focusrite Notifier in your taskbar:
If you can't see the Focusrite Notifier in your taskbar, please refer to this article: Why can't I see the Focusrite Notifier icon in my taskbar on Windows?
If this article hasn't helped you, please feel free to search again at the top of this page or, to contact support, please click here.
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