If you want to limit the results from your query that are displayed, there are a couple of ways to do that.

1. You can add a filter - maybe you want to limit your results to just rows that happened today. You can do this by adding a filter on the date column for 'today'.
2. You can sort your data - maybe you have a count of orders per day, and you only want to see the top 10 days. Go to the header dropdown for the count of orders column, and select 'sort'. Then, in the sort settings panel at the bottom right, you can add a limit. If you want the top 10 days, enter '10' and save.