In the home screen previews of the most recent files are available, but the preview includes all objects in the document, regardless of the artboard(s), so that the preview does not necessarily reflect the artwork very well.

(I routinely include loads of stuff outside the edge of the artboard, copies of elements I’m working on, template objects, etc. Which are part of my work process, but are just noise when it shows up on my preview.)

I therefore suggest that the preview only includes objects (or parts of objects) within the artboard(s).