Lookbook Page displays an impactful collection of pictures as a gallery. When users click on the number on the image, it will show the product's information.
From your Shopify admin, go to Online Store->Pages.
Click Add page.
Enter a title (ex: Lookbook). After that, choose the Theme template like the below image.
Click Save.
How to set up sections for Lookbook Page?
From your Shopify admin, go to Online Store->Themes.
Find the theme that you want to edit, and then click Customize.
Choose Pages from the dropdown window -> Choose lookbook