Hi Denis,

I would start from Columns Options, of course if we really talk about Helix Ultimate - as you said.

Phone=Mobile

https://www.joomshaper.com/documentation/helix-framework/helix-ultimate-2/layout-builder

my mistake. I used Page Builder, Column property. I want the mobile version of the site to have two columns per line. But in the Column properties there is only a choice of the order of the columns. screenshot https://osholand.com/images/columns.png

You have to switch to mobile view (top icons) then change column grid in Row settings.

here - https://osholand.com/images/1.jpg or here - https://osholand.com/images/2.jpg ?