Change Layer Content: While the change layer content menu has a lot of options, it’s very simple. If you create an adjustment layer (for example, we’ll use levels) and then decide you’d rather have a brightness/contrast layer, you can go to change layer content and switch the levels layer to a brightness/contrast layer.
Layer Content Options: The layer content options menu choice allows you to change the layer you’re working with to have different specifications. You can change the filter, color, and density.