Currently the mouse is involved in doing this: you have to locate the greyed-out Project Origin and hit ALT+SHIFT / OPT+SHIFT; or by double-clicking the User Origin button in the Standard (or another) Toolbar.
When I use a trimmed-down WE (which only shows me the Navigator and no other toolbars), this is a problem. I would like for 'RETURN USER ORIGIN TO PROJECT ORIGIN' to become a command, so I can associate a keyboard shortcut to it (instead of having to interrupt my mouse work as described above).
Archicad 27 macOS Sonoma