Clean Login forms not showing up

Hi. I’d like to try Clean Login to replace the standard WP Login and Registration forms. I installed and activated the plug-in successfully, created a clean page called “Login” and pasted the shortcode [clean-login] into it. I saved the page (twice), but the new login screen does not appear, just the standard WP version. I think I did everything the install docs suggested, but it feels like I’m missing a step or two. Is there something else that needs to be done?

Plug-in version is 1.7.5, with WP 4.6.

Thanks

https://ww.wp.xz.cn/plugins/clean-login/