I want to go back to the beginning of the file in Search Next.

The Find Next command specifies that if the string is not below it,
"No ~ was found below the current location"
appears and exits at that location.
Is there any way to get this back to the beginning of the file and continue?

In Hidemaru, I checked the following "Take a Round" option and set it to the default.

http://htom.in.coocan.jp/hmfaq8/2_find.html
For searches under the Round check box, if you have finished searching to the bottom of the file, return to the beginning of the file to continue the search.The reverse is true for the above search.