In PRINCE2, the "Closing a Project" process has the objective of confirming that the project's products are acceptable and meet the established acceptance criteria. This process ensures that the project has delivered the required outputs as agreed upon, and these outputs are approved and accepted by the customer.
References: PRINCE2 Foundation Guide, "Closing a Project" section

Section: Volume B
Explanation/Reference: http://prince2.wiki/Managing_a_Stage_Boundary#Objective

Explanation/Reference:
Reference https://mplaza.pm/prince2-benefits-management-approach-template/

The mechanisms established by the Progress theme in PRINCE2 are used by all levels of management to control any unacceptable deviations. This includes the Project Board, Project Manager, and higher management levels, ensuring that everyone involved in the project management team can effectively monitor and control the project's progress and address issues as they arise. References: PRINCE2 Foundation manual, PRINCE2 official resources