Hi Ping,
Thanks for reaching out with your BoldGrid Post and Page Builder questions.
The easiest way to create two full width columns in your page is to start with a new Section block which comes with a Row and a Column already nested inside of it.
Hover over the section and you’ll see a blue toggle icon appear. The blue icon is the column controls, you can click this icon to bring up its options.
Once you have the options section up simply click “Clone” to clone your column and it will create an equal sized column next to the original one.
Now you have two equal columns to modify as you wish. You can also select the black “Section” toggle and choose the “Stretch Section” option to make your columns span the full width of the page.
I hope this helps Ping, please let us know if there’s anything else that we can answer for you!