When the API requests breakdown dropdown selector is set to Dailly or Weekly, the Callers and endpoints dropdown can be used to select a specific day or week, and the three tables beneath will refresh to show numbers for that time period.
When the API requests breakdown dropdown selector is set to Yesterday / Hourly, the Callers and endpoints dropdown lists hourly windows, but the tables don't seem to refresh.
More strangely, when I have the API request dropdown set to "Last 7 days" / "Hourly", then select an hourly window, the table are responsive the first time I choose an hourly window. Choosing a different hourly window has not further effect - the table contents don't change. But if I choose "Last 7 days" again from "Callers and endpoints", it adds another row to the "Top 5 callers by volume" table (only that table, the other two tables are unaffected). Every time you select an hourly window after that, nothing will happen, but if you choose "Last 7 days" again it will add another row. You can repeat the process, adding more and more rows, and the extra rows don't go away until you refresh the entire browser page.