No. Both the oven instructions and the crockery's heat suitability matter. A dedicated warming setting does not make unsuitable decoration, plastic parts or damaged dishes safe to heat.
What the observation means
Plate warming is a controlled use of compatible ovenware, not a general storage function. A family plate set may contain different materials even when the pieces look similar. Stacked items can also require a loading arrangement specified by the appliance. Using an ordinary high-temperature baking selection in place of the intended programme changes the risk and the expected result.
A useful next step
Check the crockery maker's guidance and the oven's loading instructions before using this feature. Remove any item whose material or condition is uncertain. If the warming mode becomes unexpectedly fierce, stop using it and record the selected setting. Do not judge the actual temperature by touching a plate or use a glass item as an improvised thermometer.
Manuals and supporting guidance
Model-specific instructions take priority. These references support the practical principles discussed here; they do not diagnose your appliance.