Sorry didn't realise you wanted to copy a detail view. This is not possible because each detail view must have a unique detail circle and sketch in the parent view
A work around would be to create copies of the parent and the detail view, then position the dummy parent view off the sheet.
It is officially not yet possible like that last time I checked (Solution S-03049). You can copy both parent and child and have the parent off of the paper space; or if you want to lose the link, you can right click the detail view and convert the view to a sketch.
Yes, just click on the view in the graphics area
Ctrl + C
Ctrl + V
Stephen