Pin a search to the sidebar PRO

Run a search, then choose File ▸ Save Search… and Add to Sidebar. It reruns every time you open it; “last week” always means last week.

Recorded in FileOctopus on demo files. No audio. Use the full-screen button to watch it larger.

How to do it

Run a search with ⌘F, with the scope and filters you want.
Choose File ▸ Save Search… (or the Save control in the search bar).
Give it a name and keep Add to Sidebar on.
Click it in the sidebar to run it again. It stores the query, not a frozen list, so “last week” always means the last week.
Saved searches need the trial or PRO.