This is a theme component that reduces the height of the default Discourse header.

Repository link
https://github.com/discourse/discourse-thin-header-theme-component

Preview
https://theme-creator.discourse.org/theme/Johani/thin-header

Samples

Before

Default Discourse header: 690x66
After

Modified Discourse header: 690x67

It reduces the header height by about 50% by not showing the topic category / tags. The results on mobile are similar to what you see above. All the changes are purely visual and the rest of the header functionality remains unchanged.

How do I install this component?

Follow the instructions in the official guide.