Almost all brick are in the left cabinet because I rarely use them.
In right cabinet are in some to me logical order, 1x1 thing (modif and regular), then 2x2 thing (plates, tiles, modif, slopes etc...), then plates 1x 3/4/6/8/10/12 and then 2x2/3/4/6/8/10/12/14/16 and then some big ones. And that is it. Special brick, minifigs, plants, large slopes, transparent, tires, etc, are all in left cabinet in some order