To limit the number of stocks displayed in your screener, use the ‘Advanced’ section, as shown below. 

Here, you'll find an option to set the maximum number of stocks you wish to see in your screener results.

In the 'Max Stock Limit' field, enter the number of stocks you prefer to limit your screener to. You can also select criteria, such as market capitalization or momentum score, to further refine how these stocks are sorted.

Once you have entered the number, you can save/update the screener.