I can't show the page title as what you have in the demo site.

Hello,

I don't have this setting in solo-page-title.css and I don't have this issue on the demo site. Not sure why you have this issue.
Please debug your site for any CSS conflict.
Here is a content with a long title.
https://unitedstarsofamerica.com/heading-fonts-global-fonts-special-font...

Happy to look into a link if you have one.

@media (min-width:75rem) {
  h1.page-title {
    font-size: var(--solo-px64);
    line-height: calc(2 * var(--solo-px34));
  }

}

@media (max-width:75rem) {
  h1.page-title {
    font-size: var(--solo-px48);
    line-height: var(--solo-px50);
  }

}

@media (max-width:62rem) {
  h1.page-title {
    font-size: var(--solo-px36);
    line-height: var(--solo-px38);
    padding: var(--solo-px16) 0;
  }

}
@media (max-width:36rem) {
  h1.page-title {
    font-size: var(--solo-px20);
    line-height: var(--solo-px22);
    padding: var(--solo-px8) 0;
  }
}

Best wishes,
Alaa

Sorry for the noise, it was a workaround on my side. :(