There shouldn't be any limit on how many results are found. This search found 85 features.
It does only display the top 20 results with a button to load the next twenty. This button does not appear configurable.
The Query Widget can be configured to also do spatial queries and gives more options about how many results to display at once. It is however less user-friendly, so it may not be the best choice for a public facing application.
GIS Developer
City of Arlington, Texas