Disabled HTTP2

Hi, how can I disable http2 after implementing this (https://support.cloudflare.com/hc/en-us/articles/115002816808-How-do-I-enable-HTTP-2-Server-Push-in-WordPress). It’s working in Dev Tools but when I checked online like webpagetest.org, the server push is still activated. I set it to false but still showing it define(‘CLOUDFLARE_HTTP2_SERVER_PUSH_ACTIVE’, false);

Looking forward for your answer.
Thanks in advance!