Design Assist Audit Questions

I am running the design assist audit. Have a hero heading assigned as a h1 and assigned the preset k-display-s. The audit flags this and says:
- use k-title-2xl instead of k-display-s

The recommended k-title-2xl is too small for what I want.

What is the connection between the recommended preset and what I chose? I am trying to understand how/why this works.

I have attached screenshots.

Thank you.

Lynn