Hiding a grid container

Hi,
I was looking into the instructions given here: https://generatepress.com/forums/topic/hiding-grid-containers-on-tablet-and-mobile/

I have a similar situation with a 2 container grid.
I am using the left one to show a sticky container for table of contents.
I’ve applied the hide-on class for mobile and tablet, but now I see the right container still “at the right”.

Is there a way to show it centered on mobile and tablet view (once the 2dn container was hidden)?
Thanks!
Denise