Dimensions not Showing

It depends on what kind of product you are trying to edit.
If it’s a variable product, you can find dimensions under the specific variation. With simple products, they are in advanced options. Downloadable products don’t have dimensions.

I found the dimensions on the variable products, but can’t find it on the simple products.

You can see a screenshot here: https://i57.tinypic.com/65vdj5.png

@jakub, I’m not able to see the dimensions on simple products. The screenshot is above.

Please check, if your “Products & Inventory” -> “Enable product dimensions” option is ticked.

That was it. Thanks for your help.