Same goes for WordPress themes. The app allows you to switch between installed themes on your WordPress site, but you cannot install new themes from the app or customize them.
Is it Possible to Run WordPress Entirely from The App?
No. Currently, it is not possible to efficiently run a WordPress site using only the WordPress app.
For example, you cannot manage plugins using the app. Plugins are an essential part of a WordPress website and you need them to extend your website’s functionality.
You also cannot access custom post types, SEO options, use cover images, use blocks created by plugins, and more.