Adobe Animate Layering

Hello, I've been using Animate for a couple weeks now and I keep running into this problem with setting my background layer. I typically do my background last and I know that I can go to "Doc" and set "Stage" Color but I like to do it by adding another layer and dropping it to the bottom of my timeline. I feel like that should do the trick but everytime I do that it makes all layers on top discolored and I have to go back through and color over it. Is there any simple way around this problem?