There are two properties that work together to restrict the number of records returned by qListView web part. There is the "Max Query Row Count" property in the configuration editor which determines the max number of items retrieved by any single query to the SharePoint Server and defaults to 2000 unless you enter a different value which then overrides this default limit. This is a global setting which applies to the queries used in all QuickApps web parts in your site.
In qListView, there is another property "Maximum Row Count" which determines how many records will actually be rendered out of the original query results, after any sort condition has been applied. If this value is less than the global row count, then it further restricts the number of records shown. This is useful in scenarios where you want to limit the view to show the "top X" most recently modified records, for example.