In Origin 2024, we supports color plots by column label. But if you plot 2 groups or 2 layers, the column label like “aa” in layer 1 will map to 1st color, but “aa” in layer 2 may map to 2nd color. So “aa” could not refer to same value in different plot groups or layers. With the categories supports, column label with same “aa” can map to same color in different plot groups or layers.