Lists: choose many at once, search, and saved views

Tick the boxes on the left of a list (or the box at the top for the whole page). A bar appears at the bottom with what you can do with them: for members Write to them, Change type, Move to a branch, End membership and Export the chosen; approve or decline join requests and expense claims; record a payment for several renewals; mark form answers as paid; delete several notices (with one Undo). Up to 500 at once. On the longest lists (donations) what you tick stays ticked when you change page or sort, and Choose all … that match picks every row of the search (up to 500). Changing the search or filters clears the choice, and says so.
Almost every list now has search, sorting, pages and "Showing 1–20 of 312". What you searched and filtered stays in the address, so Back keeps it and you can bookmark or share the link.
Saved views: give the filters you use often a name ("Overdue in North branch") and pick them later, on any device. They are yours only.

Try it with your own organisation