Hello, if it's about the hero section from individual portfolio pages and if it's about the font size:

@media only screen and (max-width: 1466px){
.hero-title {
    font-size: 80px;
    line-height: 80px;
    height: 80px;
}

}

.hero-subtitle {
    font-size: 16px;
    font-weight: 600;    
}

change the values and then add the code to customizer -> additional CSS

Also note the media query for the hero title