How do I see which groups are using a policy or app list?
Open the where-used view for a policy or app list and Skie lists every group that has it attached. Use it before editing, retiring or deleting something from the library, so you know who depends on it. It answers 'what breaks if I change this?' without searching group by group.
In a large setup, policies and app lists are reused across schools, branches and classes. Nobody remembers which group points at which. The where-used view turns that memory problem into a list: pick a policy or an app list and see its groups.
The practical value is in housekeeping. Before deleting an old term's policy, you can confirm that no group still uses it. Before tightening a shared app list, you can see exactly which classes will lose apps and decide whether to fork instead.
It sits alongside two other checks. The impact preview tells you how many devices a pending change will reach. The effective policy view shows, for one group or device, the final rules after the organisation, school, branch and group levels have been applied. Where-used looks from the library toward the groups, and the effective view looks from the group back toward the rules.
A practical tip: when a school year ends, run through your library and check where-used for each old policy. Anything with no groups attached can be archived or left alone, and anything still in use can be forked into a clean copy for next year. Nightly backups mean even an accidental deletion can be reversed through a restore preview.