6 HTML Improvements
HTML Improvements is where Search Console will recommend any improvements to your meta descriptions and title tags, as well as informing you of any non-indexable content.
This is a very handy, easy-to-use feature that gives you optimisation recommendations that you can action right away. For instance, if you click on the ‘Short meta descriptions’ link, you’ll be able to see the 14 URLs and their respective meta descriptions. You can then go into each one of these pages in your own CMS and add lengthier, more pertinent text.
Title tags and meta descriptions should be unique for each page and fall within certain character lengths, so for the purposes of both user experience and keeping Google informed about your site.
After you fix these tags, you need to generate new sitemap and need to submit it in search console so that Google crawls new urls. More on HTML Improvements in the Google Search Console help center here.