Dip a spoon in water and stir the Levain. Just enough to eliminate CO2 and to distribute the yeast and LAB colonies once more.
As a final touch, dip your fingers in fresh water and pat down the surface of the Levain, smoothing it. Replace the lid on the container, still slightly ajar. If you’re more comfortable with a snug-fitting lid, poke 2 or 3 holes in it first. CO2 still collects in the container for the first couple of hours once the Levain is in the refrigerator.
Write the ACTUAL time that you transfer the Levain to the refrigerator on the fermentation tag. This may be a little earlier or later than you had planned.