SharePoint 2013 renders a maximum of 50 search results per page.
It is not possible to change this hardwired limit by configuring the web part.
If you set it to greater than 50, it throws an error.
I am told that the search control needs to be overridden or extended in Visual Studio.
I want the limit to be removed entirely. If this is not possible then set it to the maximum possible value.
However, paging still needs to work, so if I set the page size to 1000 then it will render 1000 results per page.. etc.
Okay, okay.
You may consider the following post to get it done – Customize SharePoint Search Results Paging…!!!. Yea, this been around since 2007/2010, the same story – inherit core result, override few methods and setup items per page property manually. Also, consider google “search core result web part 50 limit” – pretty much lots of info.
On the other hand, it might be nice thing to adop and educate customer as more than 50 item par page might not be a business requirement.