number of pages for specific category

The plugin doesn’t offer that, it just paginates your post. To do what you want, you need to play with WP_Query https://codex.www.ads-software.com/Class_Reference/WP_Query and that is not within the support scope.

I want to show 10 posts on one site in pagination on every category except one specific category where I want 20 posts. Is there any solution for that, maybe some hook or function?