I have looked online for solutions to this issue. Some other posts on the forums mentioned rebuilding my lighting to remove the preview icon from my textures. I tried that amongst other things but none of it worked.
Here is what I am seeing on all of my textures. I use one point light that is moveable and Ultra Dynamic Sky / Weather plugin.
I have Lumen enabled with Ray Lighting mode set to Surface Cache and Software Tracing set to Detail.
sorry that my fault i posted wrong topic i had many window opened
ultrasky is a weather and sky module that guive much more option that the basic setup
but when turn sun on static there is this preview all other the place (not the case with unreal base directionnal light)
so i just put the non movable option and that fine (at least shadow are backed)