At Gnome Desktop environment of Fedora workstation, maybe, if the user-password is set as nothing when installation(=by anaconda), then at the login-screen after boot, the password-nothing mode do automatic-login after deciding the login-user name, therefore password-input-screen is automatic skipped and not view, therefore gnome-switching screen ( Gnome / Gnome classic / Gnome on wayland/ ) is also automatic skipped and not view, therefore wayland cannot setting and cannot switching at login screen.

This phenomena is a defect. Even though without-password, we should be enable to go to the setting screen of wayland at login-screen.