Daily Theme Layout Customization - home page

I'd like to make a layout change in the home page's content area. I have the column view and made some changes in library/components/content-columns.php in line 26 to 31. but it is not reflecting the change.

What I want is simple layout changes on each column, such as moving up the thumbnail to the top, and lowering post title, removing authors etc...

Could you please advise me which line number I should look at to make those changes?

Thank you for your advise.