https://gh.usembassy.gov/visas/immigrant-visas/
MPORTANT IMMIGRANT VISA UPDATE
To improve the efficiency of immigrant visa processing, the U.S. Embassy in Accra is rolling out a new prescreening process. All applicants with immigrant visa interviews scheduled for September 16, 2024 and beyond will be required to attend a prescreening appointment 3-4 weeks in advance of their visa interview.
In addition to their visa interview notification, applicants will receive a separate prescreening email notifying them of their prescreening date and all documents required. At the prescreening, a document review will be conducted, and applicants will be notified if they are missing any documents. Applicants will be instructed to obtain the missing documents in order to be fully prepared for their subsequent visa interviews.
At the visa interview, consular officers will confirm whether applicants have attended their prescreening and if they have all required documents. Any applicants who did not attend their prescreening or do not have all required documents fully prepared will be required to reschedule their visa interview for a later date.
Check the Q&A section in the link for additional details.