iPhone, iPad & Mac

One app, one file, three shapes. A document is the same on every device; only the chrome around the page changes.

iPhone

The top bar: back on the left; on the right ✕ while something is selected — it ends editing first, then deselects — undo, redo and Share. With more than one page, Share is a menu with Export… and Present.
The bar at the bottom starts with + Insert, which opens Elements as a sheet ("Insert in" while a group is selected). With nothing selected, the creation tools come first and the page settings after them; select something and the bar holds its properties — tap a cell to expand it. Settings › Creation tools turns the tools page off.
Pages are the strip just above the bottom bar; the small chevron hides it and brings it back.
Layers are the Elements list, in the page settings: tap a row to mark it, then confirm or double-tap to select it. Pins open as a sheet from Position in the selection's menu.
No Quick search, no shortcuts: the search bubble and the menu shortcuts are for Mac and iPad.
Tips play along the bottom the first time you open a document.

One layout, open or folded. A fold only resizes the window; nothing jumps to a different screen.
The buttons — back, ✕, undo, redo and Share — sit in the column beside the camera.
Pages: a strip above the bottom bar when folded, a column down the leading edge when unfolded. Unfolded, the bottom bar keeps its folded width, so the page gets the extra room.
Fold or unfold while the page is fitted and it re-centres itself in the new space; zoomed in, your view stays where it is.

The top bar: back, pages, undo, redo and the document's name; on the right the inspector's tabs, Share, and the inspector button.
The inspector on the right has three tabs: Elements (+), Design and Layers. It opens by itself in landscape, the inspector button toggles it, and it steps aside while you type into a text with the keyboard up.
The pages panel is on the left, behind the pages button.
The creation bar sits at the bottom of the page, Quick search in the bottom-left corner. Settings › Creation tools hides the bar; with a pointer, so does right-click › Hide.
Apple Pencil draws in a Drawing and sketches inside a Magic AI container. Finger drawing is on from the start, so a finger draws too; switch it off in the Draw section and only the Pencil draws.
Trackpad and mouse: a dashed outline shows what the next click selects, click and drag on empty space draws a selection box, dragging an element moves it without selecting first, and right-click opens the menu — exactly like the Mac.
Keyboard: the Mac shortcuts work, arrows included.
Split View and Stage Manager: the editor keeps its iPad layout at any window size. When the space between the panels gets too narrow, the creation bar steps aside and comes back once the window grows.

A document opens in the window you are in, and the chevron takes you back to Home. Open a second one while you are editing — from the Finder, say — and it gets a window of its own.
The toolbar: the chevron, the pages button, the zoom slider, undo and redo, then the document's name; on the right the inspector's tabs, Share, and the inspector button.
Menus: File, Edit, View, Arrange, Insert and Format, most items with a shortcut. Pages ⇧⌘1, inspector ⇧⌘2, Elements ⌘I, Quick search ⌘F, a new text ⌘T, Present ⌥⌘P, Export ⇧⌘E.
Right-click anywhere for the menu. Drag anything on the page to move it, no selecting first.
Trackpad: pinch to zoom, two-finger scroll to pan. Mouse: the wheel scrolls, ⌥ wheel zooms.