Symfony: How to redirect to home page after logout

Normally it is redirect to home. Check your security.yml config file.

firewalls:        
    default:            
        logout:
            path:   /logout
            target: / #This is home url

On Symfony 4, by default, the logout action redirects to the / path. You can change the default behavior by setting the proper configuration parameter in the security.yml config file.

security:
    ...
    firewalls:
        ...
        main:
            ...
            logout:
                ...
                target: app_login # you can specify a hard coded URL path or a route name