Old cach on subdomain

[main.ap]

Hello, I have a problem with cach on my subdomain, sometimes works old code, what can I do to avoid this trouble. How can I turn off the cach only on subdomain?

[sdayman]

Create a Page Rule:
Match: sub.example.com/*
Add Setting: Cache Level (Bypass)

Make sure it’s the first Page Rule in the list.

[main.ap]

How can I add the page? I suppose I can create the page with the button Add site and page will be in list where domain is.

[domjh]

You should create what @sdayman suggested in the page rules tab of your Cloudflare dashboard.

[main.ap]

Thank you!