The view
The View menu and the view options

The right-click menu with the View submenu open: Fit to view, Zoom 100%, View at scale, Zoom to selection

The View menu

In the right-click menu, View submenu:

ItemKeysWhat it does
Fit to view⌘ 0the whole drawing in the window
Zoom 100%⌘ 1zoom 1, around the center of the window
View at scale—the screen shows the paper: at 96 pixels per inch, taking the project scale into account. With a new document at 1:1 it matches 100% zoom
Zoom to selection⌘ ⌥ 0the selection in the window; disabled with no selection

The view options

They are at the bottom of the Project panel (with nothing selected). They are editor preferences, not document ones: they do not enter the history and are not saved.

FieldWhat it does
Fast viewfast pan and zoom: during the gesture the last painted image is moved, and the canvas is repainted when you stop. On by default
Scale page labelspage labels follow the zoom; when off, they keep the same size on screen. On by default
Show originthe origin cross of the active page (X pink, Y green). On by default
Show object originthe origin of the selected object, with its two axes rotated along with it. On by default
Dark themethe dark theme of the interface; the page paper stays white