["Collapse All" Option in the Layers Panel]

+1

[Rename artboard from canvas]

+1

This looks technically feasible and would enhance user experience by a lot.

Currently you have to click on the artboard on the canvas, then go to the layers list, double-click (or sometimes triple-click because click detection is a bit finicky in the side panels) the artboard's name, wait for the text input to open, enter the new name, press enter, wait for a black flash on the layers panel and continue with the next artboard. It can become tiresome on large documents.

Whereas on-canvas renaming would be as easy as double-clicking the artboard's name, entering the new one and you're done.