Slight difference on Win10 and Version: (5.0.0-rc2-dev-44-gde6b32d23), release build
Drag box selects items, immediate applied default is place(move) (but image suggests duplicate, as two copies display, until screen redraws eg on zoom, a minor wrinkle)
Right click has choices of Place/Cut/Copy/Drag/Duplicate/Delete
Duplicate sightly differs from Copy, in that Duplicate is live, and Copy is 'to clipboard', which means you can switch sheets and paste later.
Seems good, but I do spot one bug - in Copy/Duplicate of a resistor network, the unit-number is dropped, and all selections become unit A.
Could be an artifact of the moronic R?A empty field default, whereby no attempt is made to tag 'next available RefDes' (aka auto-increment), a simple and very useful feature found in many/most? other tool chains.
Such discard of all information on copy, means a lot of manual checking/mouse moves and clicks to actually finish any copy. Auto-annotate tools will fail, if the unit number is lost.