The Editor

Edit on a column set opens "Edit: {name}" — the Name field up top, then tabs with live counts: Columns (N) / Folder Rules (N) / Sort Rules (N)/ Stats (N) / Charts (N) — plus Diagrams (N) on Catapult sets only.

One rule to remember: nothing saves until the pinned Save* Work across as many tabs as you like — rename columns' order, add rules, build a stat — and one Save commits every tab's changes at once. Backing out without Save discards them all.