Bank details belong to the active business and can be changed only by someone with finance access. Open Profile to check which business is active. If you do not have finance access, ask the business owner to update the masked payment destination in Finance.
Check the active business
Open Profile first and check which business workspace is active. Bank details belong to that business, not to an individual member profile.
Use the finance owner
A member with finance access can change the masked payment destination in Finance. Ask the owner when your role does not have that access.