Find Similar Display (Gutenberg Block)

Hello
YOOTHEM has released a new theme
Beautiful)
But the most beautiful thing is how they made a side menu on one of the pages
https://demo.yootheme.com/joomla/themes/devstack/developers/feature-index
main advantages:
1. Full page width is used
2. The side menu when scrolling the page up sticks and remains visible
3.The link to the (Learn more) transition is nicely designed

I’m a Divi subscriber
and I asked the elegant support how to do exactly the same?
they sent me instructions, but it’s really awful, it turns out ugly ((((((
Please tell me – maybe someone saw such a Gutenberg Block among the ready-made ones – I would like to design a page on my website in this style)
Thank you