If you don’t want to display the user’s cover photo on their profile page then you will need to customize the profiles/cover.php template.
First of all, you should learn how the template system works. Read more information in this article
https://wpusermanager.com/article/121-templates-customization/
Your custom cover.php template should look like this:
https://gist.github.com/wp-user-manager/b68f43658b51d2d899ebdcb8bda92303
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