Accidentally Pasted Beyond Origin in Altium
Method 1 (the quick way):


Make all layers visible: Layser Set(LS): All layers
Select everything outside the extremeties of your board. (Keys: S O) then draw a box round your work area
Go to PCB List view.  Filter on selected
Highlight and Delete selected.


If you don't want to delete stuff you can always move it, (Keys: E M S)

Note: In AD18 or Nexus you will need to ensure you are not pre-filtering anything.

Method 2 (the slow way):


Set the origin (Keys: E O S) beyond the bottom left edge of your work area
Go to PCB Filter view
Enter filter (X1 &lt; 0) or (X2 &lt; 0) or (Y1 &lt; 0) or (Y2 &lt; 0)
select matching and apply.
Press delete button
Set the origin (Keys: E O S) beyond the top right edge of your work area
Go to PCB Filter view
Enter filter (X1 > 0) or (X2 > 0) or (Y1 > 0) or (Y2 > 0)
select matching and apply.
Press delete button