Haven’t Content Source in Portfolio Layouts

Hi, I have create a lot of portfolio, but in all of them I haven’t the Content Source section between “Preview” and “Custom CSS”. I need to assign a page Url to all images, in this way I can customize every element (for example create a page whitout sidebar and the other page item attributes). I have 7.0 PHP Version, the last plugin version 1.9.3, the last version of wordpress 5.0.3 with the Kute-Boutique Theme. Can you helm me?
best regards
Francesca