Hello Eugene,

If you inspect the portfolio grid tiles you will see

@media only screen and (max-width: 1466px){
       .classic-grid .item {
              margin: 70px 40px;
              width: calc(50% - 80px);
              height: 24vw;

       }
}

These are the attributes you need to change if you want to change the number of columns

Removing the title: disable hero section in portfolio grid page options and then disable also the default page title in customizer -> general settings

Send us wp admin access in a private comment if possible so we can try to remove it.

Hello Eugene

I've added

.hero-hidden {
    display: none;
}

in customizer -> additional CSS