Column Automatic Resize

Hello! I’m trying to make it so that the columns fills in the empty page if the page is zoomed out. If the page is zoomed in, it would look normal. Although, there would be tons of empty space if you try to zoom out the webpage.

Here’s what it looks like in the List View:

https://ibb.co/jhzLXSP

If you zoom out, you’ll see a ton of space that shouldn’t be there:

https://ibb.co/m8H2Qfn

Note that the category list on the right needs to stay there.

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