Even after choosing web apps from "Advance Setting" the application still doesn't appears in "Web Apps"
In order for it to appear in Web Apps, you have to make a new build of your application after enabling the setting, then mark that build as released. This is described in more detail here:
https://dimagi.atlassian.net/wiki/spaces/commcarepublic/pages/2143955500/Using+Web+Apps#Setting-up-web-apps
Are you still not seeing it after having done that?