Dear Ms. Zudans,
Thank you for posting your question on History Hub!
We searched the National Archives Catalog for any records relating to displaced persons camps. The search results can be viewed here.
Also, the United Nations Relief and Rehabilitation Organization (UNRRA) was responsible for the administration of displaced persons in Europe. We searched our online catalog for “UNRRA” and “displaced persons.” The search produced the following results. In 1945, UNRRA became part of the United Nations. Hence, its records are located at the United Nations Archives. The website is https://search.archives.un.org/
We hope this information is helpful. Best of luck with your research!