No need to stir, stop it.

keep it topped.
The reason it settled like that was the two 'clarifiers' (that is just
another name for a fining agent) were different electrical charges so
they 'stuck' to one another and the result was heavy enough to drop.
Let it sit, maybe give it a twist or two if you see sediment stuck to
the walls.
Rack when a flashlight beam shining through the wine looks the same at
the top and bottom of the carboy. It's an easy way to see if it's
settled. You will see more beam on a cloudy wine than clear, kind of
like the effect of headlights when driving in fog.
Joe