Caching is not working properly

Hi, caching is not working properly, when I turn on development mode, the problem is solverd, but this turns off after 3 hours. I tried to use exception but this not gives the right solution. Please let me know the beste way to solve.

We have an ecommerce website, and when people add things to cart of visit dynamic pages it gives errors.

Is there a way to activate the development mode permanently.

Hi,

Cloudflare does not cache HTML by default. Are you using a Page Rule with Cache Everything setting, or a Cache Rule, or some specific feature such as APO for WordPress? Can you share your domain name?