Chances are that the issues found on your sites affect many of their web pages, but in reality it's the same issue over and over again. In many cases, the affected code lies within a layout or a shared template, so fixing it once will remove this issue from hundreds or thousands of pages at once.
HTML / A11Y issues tab
To help you understand the big picture, Rocket Validator gives you a summary report that groups together all the HTML issues found. To see it, just click on the HTML issues or A11Y issues tab:
On this report, you'll see all the issues found in all the web pages, grouped together and ordered by their frequency. For each issue, you can see how many web pages are affected by it.
The grouped issues are ordered by their severity and the number of web pages that it affects, so you can concentrate on fixing the most important issues first.
Seeing web pages affected
Click on an issue, and you'll see the pages that have this exact issue, and how many times it appears on each different page.
Once you've found and fixed this issue on your site, you can click the "Re-check all pages with this issue" button to re-check all the web pages affected by this issue.
Issue on a given web page
You can also click on one of the affected pages to see where this issue happens exactly in the web page. Click on the line and column buttons to jump to the exact line in the HTML code.