You can disconnect the GH within the service settings. More info: https://docs.railway.app/guides/github-autodeploys#configure-the-github-branch-for-deployment-triggers

i disconnected but still when commit any change to my github repos the railway project auto deploy , and cause i disconnected i can't go to the settings and change var… right? that's what happening right now i can check what is wrong, and on the project there's phrase said"service will be deleted" what's that mean ? and i didn't want that deplyment project how can i delete but not effecting my github repos?

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service will be deleted

Have you clicked on "Apply change"?

I think no , but if I click on that will effect bad in my GitHub repos?cause now if I commit any changes to my GitHub repos the icons that related to railway failed deployment appears