No option to change template

Hi, i have a problem with some sites in my wordpress. I want to change the template but there is no option on some sites. But on others yes. what is wrong.
I want to change the site “Shop” to a page with sidebar for the woocommerce shop standard site.

Theme:PhotographyVersion: 6.4.1 ThemeGoods -Premium Photography Portfolio Theme
Wordpress: 5.4.1–de_DE

Please contact the theme author: