Applicable Model:
If Razer Kiyo is detected by Razer Synapse but the camera preview and other settings are disabled, your system has not recognized it as a camera.

Follow the detailed instructions below to fix 'Preview Disabled' error from a Razer Kiyo.
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Go to the Device Manager and look for "Razer Kiyo" under the other device categories.
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Right-click on the Razer Kiyo and select "Uninstall Device".
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Check the "Delete this driver software for this device" and proceed with the uninstallation.
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Unplug and re-plug the Razer Kiyo into your system.
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In Device Manager, click "Action" > "Scan for hardware changes".
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Check if the Razer Kiyo has now been recognized as a camera.