To test a Visual Query you can set parameters to be used while testing. 

  1. Go to the Visual Query Configuration and scroll down to Test Parameters
  2. Type in the list of placeholders you want to override, like [Source:Property]=Value
  3. In most cases you will overwrite Params: [Params:AuthorId]=42
  4. You can also overwrite others like [QueryString:Author]=42
  5. You can also use other tokens [Params:AuthorId]=[App:Settings:DefaultAuthor]

have fun!