Thank you all for your assistance, finally it's solved after some searching in customize page, when I opened the product page and clicked on the product details area, then a Product Main tap appeared, after that I found the Description disabled. than...

Hello StoreWatchers, I didn't find  product summary section.

Hello,I'm using Kalles theme and the product description not showing, I need help fixing it. my store url  babyzone.io . Thanks.