Generateblocks container width

Hi.

I am using Generatepress theme with the GB, and I trying to make a simple portfolio pages.
It fits the idea of having a very light weight website.
Again, I comes up with so many beginner’s issues.

Recently, I have confussions about the container width.
I am editing my WordPress site using Chrome Browser.

First, I’ll start with the GenerateBlocks Grid.
In the Desktop Tab, I set the width to be 50%, so it would displayed the images in 2 columns, but it only works in the back end while I’am editing the page.
* Windows – Firefox/Chrome, it displays right.
* Android – Chrome, it displays the images 1 column only.
* Android – Chrome desktop site, same thing.
All the grids, positioned left, unlike my products page which the GB Grid works nice.

My questions are :
1. How to make the grid displays 2 columns? Am I missing some thing?
2. How to make the grid displayed on PC to be in the center of the page?

A week ago, I don’t find this issue while I am working on my products page.
Really appreciate the help.

thanks.

The page I need help with: [log in to see the link]