It's possible that the changes are not being deployed to the correct directory. By default, WordPress on App Service is deployed to the D:\home\site\wwwroot
directory.
Also you could check the cache similarly as descibed here:
https://learn.microsoft.com/en-us/answers/questions/1419315/azure-web-app-code-not-reflecting-after-changing-v
If changes still aren’t visible, restart your Azure App Service
You can mark it 'Accept Answer' and 'Upvote' if this helped you
Regards,
Abiola