Dear @egorkraft
There is no implemented sticky option just yet but a look in the right direction if i can help in any way.
This will require a basic understanding of CSS:
https://laytheme.com/documentation.html#custom-css-styling
& you may wish to use Developer tools to help you as well:
https://www.khanacademy.org/computing/computer-programming/html-css/web-development-tools/a/using-the-browser-developer-tools
The Custom CSS you would be adding in 'Lay Options - Custom CSS & HTML" :Screen Shot 2020-09-14 at 2.51.54 PM.png
Some links into 'sticky' CSS:
https://www.w3schools.com/howto/howto_css_sticky_element.asp
https://medium.com/@elad/css-position-sticky-how-it-really-works-54cd01dc2d46
Additionally check out this thread:
http://laythemeforum.com:4567/topic/3877/placing-sticky-element-in-the-gridder/15
Best of Luck and apologies that 'sticky' isn't in yet, Armin is working really hard on Woocommerce implementation right now,
And as always thank you for being a Lay Theme user and keeping focus on topics like these :)
Have a wonderful day & best wishes
Richard