Help! Quick Stack Issue with Responsive Layouts

Hello! I’m having a seemingly very basic issue adjusting Quick Stack layouts for different screen widths. View a Quick Stack element on the About > History page.

When I try to adjust the parent’s column sizes on smaller screen widths, it will not let me decrease the column sizes. I’ve also adjusted the cell spans to allow for the decrease but it will not let me increase or decrease spans. Vice versa order and I’ve had the same result.

I’m seriously stumped–I’ve watched tutorials and also somewhat recreated the issue on a blank site. Thank you for your advice in advance!

Here is my site Read-Only: [LINK]1
(how to share your site Read-Only link)

Still looking for help with this :pray: