If the admin has set “Allow seller to add products with SKU type” as “Dynamic”.
Then the sellers will not have the product SKU field on the Product Edit page as it will get created automatically. But still, the seller can edit the dynamic SKU of product.
For this, the admin first needs to set “Allow seller to add products with SKU type” as “Static” from the backend.
Now the sellers will navigate to the Product Edit page of the product and can view the product SKU field. And then, can edit the product SKU easily as per their choice or dynamic SKU of product.