I am amazed that a simple and obvious ticket like this has not been addressed after almost six years of complaints.

I wish the custom announcement idea would work for me, but I believe in the "new" cloud Jira, the Announcement option has been removed, so I can't even hack this away. It's incredibly irritating.

Thanks Leonard. Good tip.

I added another line to the code as "kanban board" showed up for me again with the same 24px font size. 

<style>body#jira span.subnavigator-title{font-size: 14px; padding-top: 10px; } body#jira span#ghx-board-name {font-size: 24px;} body#jira span#subnav-trigger-work {font-size: 14px;}</style>

It would look like this:

I have noticed that disabling the subnav-container class will also disable the "Switch Sprint" Option used in Multiple-Sprint Scrum Boards.
I have edited my Announcement Banner CSS-Injection to the following string:

<style>body#jira span.subnavigator-title{padding-top: 10px; font-size: 14px; } body#jira span#ghx-board-name {font-size: 24px;}</style>

 The Scrum Board now looks like:

Simon, thank you for pointing that out! I thought it was a file in the server. Never paid attention to the Announcement Banner section.

Wow! this did it super nice!

Thanks Simon! - You made my weekend  
Neat and simple workaround without needing to edit any files on the server, and which will probably survive upgrades!

Hi Pablo – sure. You can edit the Announcement Banner as per https://confluence.atlassian.com/adminjiraserver073/configuring-an-announcement-banner-861253135.html

I think it's about the same independent of which version of Jira you're running, but you should check.

Simon

Simon, would you please share what is the exact file containing the "Announcement Banner"?

In the Announcement Banner, I added the following CSS:

<style>body#jira span.subnav-container {display:none;} body#jira span#ghx-board-name {font-size: 24px;}</style>

Definitely a workaround, but it does the job that many of you seem to be asking for. Note that this may not work for the Cloud version (we run Server). Worth a try though.

I would also comment that it would be nice to not even display 'Kanban Board' at all, or at least have a setting somewhere to hide it.  Is anyone familiar with any workarounds to hide the 'Kanban Board' text?