What is the difference between these GUID's in wordpress feed?

My RSS feed currently contains generated post GUIDs URLs that use the post slug:

guid isPermaLink=falsehttps://sitename.com/postname//guid

However I want to use the ?p=postID format instead:

guid isPermaLink=falsehttps://sitename.com/?p=3566/guid

How can I change this? Thanks in advance!

Topic guids feed rss Wordpress

Category Web

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