Can I limit how many results are returned?

Yes, you can! This is controlled at the data set level. A great use case would be if you want to see a "Top 25" list.

To adjust the limit, go to the Map and select the data set in question. Click on the settings icon to the right of the drop-down. Select the Other tab. Limit is an option with Order By, which will help determine the sort order of your records.