Enscape calls a background HDRI a "skybox" and loads it from the Sky tab of Visual Settings. This page lists HDRI Hub's outdoor environments that work as Enscape skyboxes, with the exact menu path, the resolution that makes sense for real-time rendering, and how to get a clean sun and shadow from an unclipped sky.
















































Enscape accepts .hdr, .bmp, .jpg, .jpeg, .png, .tif, .tiff and .tga skyboxes in cross or panoramic (longitude/latitude) layout.
Enscape's documentation does not publish a fixed pixel cap for skyboxes. For lighting and reflections only, a 4096x2048 to 8192x4096 HDRI is enough. For a skybox the camera sees directly, use 16000x8000 to 20000x10000 so the horizon and cloud detail stay sharp; because Enscape renders in real time, 8192x4096 to 10240x5120 is a practical ceiling for most scenes rather than the full 20000x10000 files.
Use an unclipped sun HDRI so "Brightest Point as Sun Direction" locks onto the actual sun disc instead of a blown-out highlight. HDRI Hub has 52 unclipped skies for this. With one of these loaded and Normalize Average Brightness enabled, the skybox supplies both the light and the cast shadow; no separate Enscape sun light is needed.