Match the complete model or product reference, not just the brand and a similar control-panel photograph. Manuals can cover selected variants with different features.
What the observation means
A function listed as optional may not exist on your oven. Country, fuel arrangement and revision can also matter. A user guide and a service manual are different documents, with different intended readers.
A useful next step
Use the manufacturer's own manual finder where possible and confirm the matching identifier. If an instruction does not correspond to the actual controls, stop rather than improvising. Keep the manual's title and version with any support enquiry about the discrepancy.
Manuals and supporting guidance
Model-specific instructions take priority. These references support the practical principles discussed here; they do not diagnose your appliance.