A timed programme may still be selected. The correct way back to manual cooking depends on the clock design, not simply on setting the current time.
What the observation means
Similar range cookers can use different clock modules across revisions. Holding buttons from an unrelated online example may alter another setting. The display's exact symbols matter.
A useful next step
Locate the matching owner guide and follow its manual-operation procedure. If the symbol will not clear as instructed, report the model and display. Do not disconnect or bypass the clock, and do not assume an unaffected hob proves the oven timer is functioning normally.
Manuals and supporting guidance
Model-specific instructions take priority. These references support the practical principles discussed here; they do not diagnose your appliance.