E.g.

Select A1 cell and copy (Ctrl+C). Select B1-B3 and paste. B1 -B3 will be filled with A1 value.

Select A1 - A3 cells and copy (Ctrl+C). Select B1-B6 and paste. B1-B3 will be filled with A1-A3, B4-B6 will be filled with A1-A3.

Set System variable @CPNB=0 to roll back to old behavior.