On a permit page, click the Waiting On column header to group the milestones by who has the next move: you first, then the agency, then your contacts by name, each in due date order. Milestones that aren't waiting on anyone stay at the bottom either way. Click Due Date to go back to date order.
Once a milestone is waiting on someone, a Waiting on filter appears above the table, as on the Permits page. Pick yourself to see only what you owe, the agency for what's sitting in plan check, or an engineer or client to see everything they owe on this permit.
To fill it in quickly, select some milestones and use the new Waiting On button in the bar above the table. It sets them all to you, the agency, the project's client or anyone on its team, or clears it. This is handy right after Add standard milestones, which adds them with no one set.
As before, who a milestone is waiting on is for your own records: it never appears on the client dashboard or in your calendar feed.