This actually fixed it for me. However, you have to have at LEAST one static mesh in your level (excluding your landscape) before it renders correctly. As soon as you start a PIE session, it works fine.
Both this fix and the problem i mentioned seem like bugs to me. I don’t remember this being an issue in the past. However, these are some old posts…
hi.
this happened to me since version 4.25, and persists in 4.26.1.
Distance fields shadows are working just fine, but i have to edit them blindly, the visualizer won’t work.
the fix provided by Trench_ZY didn’t make any difference.