Here’' I’ll show a solution which can load up to whatever limit is set at the SSA or tenant (which by default is 500) on the initial load of the CSWP. I will use the same approach as I did when configuring the OSSSearchResults.aspx page in How to do a light weight search center using osssearchresults.aspx (part 2/3).
The limit of 50 is hard coded in the CSWP server side – see my original post for details.