Pro Tools/grid Mode Editing Options

[meadows.83]

i'm in grid mode, and i'm trying to select a tiny piece of audio, like one drum hit, but i don't know how to lower the scale in grid mode, so i i can only select
a group of notes, like four or five, and not a single note. I know there is a way to lower the scale to 1/16th note, but i don't know how. anybody know?
thanx