On turning on 'rendered mode' in Eevee you literally see the image on the left - a flat, grey canvas. Which can be frustrating, but it's also a metaphorical CANVAS for lighting experiments 🤭
So it's all good!

p.s. The img from the upcoming #eevee course for #blender.

Wishlist our course: https://www.creativeshrimp.com/free-sample-eevee-lighting