I have created an empty level, adding in a SkyAtmosphere, a directional light with the Atmosphere Sun Light enabled, and a SkyLight. But, I don’t see the atmosphere.
That’s weird. What is the intensity of your directional light currently set at? Maybe some setting was set to zero or affects world was unticked by accident?
I think it’s because I changed things in the project to optimise it for virtual reality. I have done the same in an empty project with Unreal 5.3.2 and it works perfectly, so the problem is something that I have changed on project settings.