Installed, but not what I was expecting.
I thought dragging the Lazarus IDE form/title bar would allow me to drag the whole IDE, so all windows onto my other screen (and not one-by-one as before installing the package).
IDE docking "headers" are not showing
Navigated to "Tools" - "Options" - "Environment", but there are no such "Docking / Anchordocking" options group or related attributes.
Meanwhile I restarted the IDE a few times.
I will create a bug report.