You can use PostProcessVolumes in any blueprint to quickly change the color of the screen. For example, if your player gets injured you can flash a red tint to the screen. If your player discovers an item, everything can glow, etc. The possibilities are large. Her I’m using a PostProcessVolume in the level blueprint to fade the level in when the player begins. I got the settings from it and from there typed Set members and when selecting that node, clicked on the settings I wanted to set. Then in the timeline I made a color that went from black to white.

If you want to change screen color outside of the level blueprint, just add a PostProcessVolume to the blueprint and click “unbound” and then you can edit it the same way.