Elementor landing page as front end of web site.

[improvedexecutivefcns]

After studying tutorials, pulling together some graphics and text pieces, I think I can sketch a decent Elementor LP.
But I need to know where the LP can live on my web site and how to set it up as a front door to my site that blocks the site until a visitor signs in on the landing page form. Can this even be done?

 

[busfizz.nl]

This is not an elementor issue and can be resolved by using the Wordpress backend.