I know I ought to be able to sort this out but I can't see what I've done.
Normally, when I'm editing, the cursor travels over the sound window left to right from the start point and, on reaching the RH side disappears - though I can still see it on the overview window. Suddenly, (I must have accidentaly clicked on something) when it reaches the RH side the sound window refreshes and the cursor continues again from left to right.
There's nothing wrong with this but it doesn't suit the way I work. How can I make it revert to the previous mode? I've no idea what I must have done and can't find any reference in the manual.