Clicking on the bars on all the graphs in the Stats page opens the Browser with a search query to find the corresponding cards. However, the Reviews graph is an exception. It’s probably because previous versions of Anki didn’t have a search query for filtering such cards. But, now, we have a search query which can be used.
Example: To find cards rated 18 days ago, use prop:rated=-18
When a larger period is selected (e.g. 1 year), each bar represents multiple days. To find cards rated 96-100 days ago, I tried prop:rated<=-96 prop:rated>-100
but this doesn’t seem to work correctly. So, either this query needs to be fixed or we may need to skip adding this feature (search on clicking graph) when a bar represents multiple days.