Play quality worse

The top image is when I hit Play, the bottom is when I stop the simulation. What setting(s) are causing this?

Thanks.

Either play around with the mip maps (in the texture editor -> you can choose between different modes) or disable texture streaming: https://answers.unrealengine/questions/25898/how-to-disable-texture-blurring-based-on-a-camera.html

That is the Screen Percentage setting mainly also texture quality I guess. Look at scalability settings and engine documentation on them.

This is what AtsK was talking about: https://docs.unrealengine/latest/INT/Engine/Rendering/Scalability/ScalabilityReference/index.html
I would also guess screen percentage (can be set by r.ScreenPercentage in the console).

Thanks everyone.