Reset owner of folders and files in a domain

Hi,
when I realized that someone used my ftp account to upload a file to my server without authoritation, I changed the name and pass of the subscription owner (the owner of the domain), but now all the folders and files in my domain has another user as owner (the other_user_name in my post). Plesk changed the old owner by another one instead of change the name of folders and files owners.
Is there any way to reset the owner of all my domain and subdomains?
The command chown...

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