Hi @leo,
You can’t currently change the width of the menu container on a single page, even if you try to add a second hamburger menu on the page. I’ve passed this feedback on to the Editor X team.
However, I can propose an alternative idea to try. On the specific page where you want the menu to be wider, you can add a shape or vector art as the hamburger menu icon, and link it to a lightbox. Make the lightbox slide from the right. And place a vertical menu within the lightbox. Essentially creating your own hamburger menu on that specific page.
I hope this helps.
Carmel