It's a normal phenomenon to occasionally appear yellow. You don't need to worry too much. It's a normal metabolism in the growth stage. You can cut off the yellow leaves. If you want to keep this leaf, you can only cut off the Yellow tips, so that although it won't grow from the original position, it can avoid further spread, or affect the ornamental
There are a lot of yellow leaves in the growth, and they haven't recovered in a short time after the maintenance method is changed. In this case, the whole leaves should be removed, and the petiole should be extended downward. The whole branches can be cut off directly, and then the cause can be found out. According to the specific situation, the maintenance environment should be changed, especially the application of water should be controlled, so that the plant can gradually recover to health.
If the root rots due to excessive watering, which causes the yellow leaves, not only the leaves should be removed, but also the roots should be pruned and planted. You can also cut the healthy branches from the plant, about 15-30cm, remove the leaves at the bottom, and then directly use the culture soil for planting.