Hi,
As shown in the picture and described in the title, I created a blank Unreal project, start building UI material, but when I right-click on a node and select “Start Previewing Node”, the preview window displays nothing. Any idea about something I would have done wrong ? Maybe a config option I should have activated ?
I finally solved the issue.
I am on 5.7.1 and it seems to be a already identified issue.
Going to Project Settings > Engine > Rendering > Substrate and uncheck Substrate Materials solved the issue for me