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.