Keynote
Justify the text
In Keynote, Option + Cmd + Vertical bar will justify the text. It is listed for the Mac.
Where it works: Editing text
On a US English keyboard this character needs Shift and the backslash key. The shortcut itself is unchanged.
Where this comes from
Keyboard shortcuts for Keynote on Mac - Apple Support
Documentation checked on 2026-09-14. That is a documentation review, not a test run inside the application.