As you click “More time series”, “More visualizations” or “More datasets” you get to advanced search results mode. Here, in addition to full list of results, you can use filters to specify your request.
Using filters, you can specify data sources, topics, regions, data frequencies, data depth, and year of last update. You can combine different filters to narrow your search. For example, you can select quarterly frequency and last updated in 2018. The results will be refreshed to include your filters.