Create Two Homepages In One with Toggle Button

I have a photography client of mine who is looking to divide her site into two - one to showcase her photography, & then the other to highlight her course offerings. How can this be achieved?

I found this website that is set up almost identical to what we envisioned - https://www.coastalcollectivemarketing.com/

& the site is designed on Squarespace too!

How can I achieve this look? I inspected the code & purchased Will Meyers Tab code injection but I believe I'm missing components to make this possible. 

Also - is there any way to create separate navigation options for each side of the site? Or would this make everything too complicated?

Thanks! 

On the split site navigation issue please see the following.

Usually what folks do is the home page of the website becomes a landing page with the header and footer hidden and links to the two halves of the site. You can obviously get fancier as with the example site you show but I don't have any insight into all the effects that are going on there.

Let us know how it goes.