Hi Giuseppe,
Thanks for the screenshots.
It seems your homepage section is built with SP Page Builder's Articles addon. There's an option in it that controls the thumbnails:
- Open the homepage in SP Page Builder and click the edit (pencil) icon on the Articles addon for that section.
- In the General tab, scroll down to the Options group.
- Set Hide Thumbnail to No.
- Click Save, then clear the cache (System → Clear Cache) and reload the page.
Screenshot for reference: https://cleanshot.com/share/hhdS9mdl
Note: In this Creative layout, the small list items next to the lead article are text-only by design. The option above brings back the images in the bottom grid.
If the thumbnails still don't appear after this, check that each article has an image set in the Featured Image field (Blog Options tab), and let us know.
Best regards,