What do I need to change in my head/header file to change my Google entry?

[zad]

On Google when searching for my site, this is what pops up

However, what I want it to look like is

Less Likely | Statistical Science & Related Matters

For my other blog posts and articles, this is how they appear, but for the home page, the screenshot above is how it appears. I’m not sure where exactly the problem is. I’ve attached my relevant GitHub partial files which I think may contain the problem

[zad]

@maiki I noticed that you unlisted this post, is there a reason why?

[maiki]

Administrative pause.

[pointyfar]

Hi there,

We do not provide support for Google search / SEO / general web dev questions on this forum. You might have better luck asking elsewhere.