Set column number for one page

Hello everyone,

Can anyone please help me change the column number for one page? At the moment, ALL my product pages are set to 4, but I want just one page to display 3 products/images. 

https://www.ptphotography.com/harcover-books

The problem is if I don't set the column numbers to 3, to fill the space that is supposed to be taken by the fourth product (product 4), the 3 products(pictures) looks like they are aligned to the left. 

Thank you in advance! 

Hi. Have you solved it yet?

17 hours ago, tuanphan said:

Hi. Have you solved it yet?

Hi @tuanphan, thank you for reaching out. 

No, I have not solved it yet. Can you please help?

Best regards,
P