When cloudflare server is generating data from your server and page has slider, is there any possibility that cloudflare will cache data which is only displayed in current view and data which is in next slides will be not cached by cloudflaire? I mean when user browses the page (which is connected to cloudflair) he will be not abble to see all text containing in the hiden slides ?
Cloudflare is a pull cache, therefore files will be cached on request. You can tell Cloudflare what to cache or not via the HTTP header.
However, you can’t hide content from users by disallowing caching. You can hide content from suspicious visitors with SSE, but if there’s content you don’t want to be accessible to everyone, you should consider to protect it with a login.