Cannot select part of track

Cubase AI 7

When I attempt to select part of a track (for example to delete) Cubase confines me to selecting blocks of about one second increments. I would like to able to select with greater accuracy than this. I’m sure I have done so before but I’ve had a break from using Cubase for a couple of years and cannot remember what I did. Any help appreciated.

You mean selecting a range of an audio event…?
Disable the grid…?!