A half-width selection may intentionally use a smaller area. Check the complete knob marking before concluding that the unused side has failed.
What the observation means
Food placed outside the selected grilling area can remain pale even when the function is working as intended. A change on a confirmed full-width selection is different evidence.
A useful next step
Use the manual's layout and record which mode was chosen. Do not stare closely at a glowing element or reach into the compartment to compare heat. If full-width operation has changed, provide the side and cooking result rather than assuming a specific element section needs replacement.
Manuals and supporting guidance
Model-specific instructions take priority. These references support the practical principles discussed here; they do not diagnose your appliance.