To limit the amount of rows extracted and stop the scraper extracting more than needed, you can do this with the function "Maximum number of rows" feature
Select an extractor which you would like to modify from the left panel. Click on the "INPUT" tab
On the input box "Maximum number of rows" enter the maximum number of rows you want to get back for a session
e.g. if you enter 100, you will get back a maximum of 100 rows even if they are thousands of more rows to be found in the starter links. If you leave as 0 or empty . The extractor will find all the available rows in the url
Once you are done, click on "updated settings"
Once you have updated you can run you extractor and it will return back the number configured