Unable to vertically drag or overlap tracks

I must have hit a key combination by mistake, but I can no longer drag track contents vertically, nor can I overlap different sections of waveform on the same track - moving one section moves the others a consistent distance. Advice? Thanks!!

You went into Ripple Mode most likely, though I am not sure what you mean by cannot drag track contents vertically.


You were exactly correct, of course. Thank you!!