Is the opening supplication (Subhanaka Allahumma wa bihamdika, wa tabarakasmu…) recited in both obligatory and voluntary prayers?

Question:
He says: Honorable Shaykh, may Allah grant you success. When you prefer the opening supplication "Subhanaka Allahumma wa bihamdika," do you mean preferring it in the obligatory prayer, or is it general for both the obligatory and voluntary prayers?

Answer:
It is for the obligatory prayer. As for the voluntary prayer, it is better to use the other types of opening supplications. Yes.