Remove "by [username]" in a GitHub Pages document.title

I have a GitHub Pages site, and I don't want to use the raw html to develop the site yet because non developers on the team will be pushing.

The problem is that the document.title contains "by [username]" at the end. I want to remove that and just make it be the beginning text.

I already tried title: [custom title] in Jekyll and it still has the organization name at the end.

I am using the Midnight theme.

Thanks!