It would be useful if there was a way to make legends by default not include every item in the map. I am aware automatically adding new items to a legend can be turned off after the legend is made, but how about before the legend is made. When you have lots of layers and/or multiple legends and/or multiple layouts and need to add another layer or legend to the map this behavior can get really annoying. Besides wasting time with layout tweaks and re-tweaks this can cause crashing just when making a new legend because there's so many layers to grab into it.