Adding the Portfolio section and problems with the diamond

(I posted this in the free forum by mistake. I just realized that I have the pro version) I’m helping a friend migrate her website from Wix to a managed service with wordpress installed. I picked the verity theme and I was migrating the content but I’m now facing two issues: 1. The home page does not look like the demo theme: http://sushmas5.sg-host.com I wanted the posts to show up in the three column format (like the project section in the demo) https://wordpress.com/theme/verity 2. I tried removing the diamond in the blog posts by inserting the following code: .square { display: none; } but that just made the featured image large and show up on the page. Example: http://sushmas5.sg-host.com/holiday-2020-shimmer-or-bummer/ Can you help?