Ranges, Access and What It Is Not
Three ranges: 30 days by day, 90 days by week, 12 months by month. Everything is worked out in your company's own timezone, so a period boundary means what your team thinks it means.
Insights is for company owners and HR administrators. Regular employees do not see it, which matters because a page showing who gives and receives the least is not something to put in front of everybody.
Being straight about the edges: there is no CSV export and no custom date picker today, and the department view is a breakdown rather than a filter you can apply to the whole page. If any of those decide it for you, tell us, because that is how these get prioritised.
The same numbers reach owners and admins in the Friday summary, in Slack or by email, so the dashboard is where you go to dig rather than the only place the information exists.