Site Audit enables you to monitor your website for over 100 SEO issues, which have been pre-set for your convenience. But you are free to toggle them on or off and change the level of importance for each. Here's how.
Configuring pre-set issues at the Global level
To view the Global Settings or Issues Setting at the global level, first click on Site audit where you will land on Site audit dashboard with a list of projects that you have created, then click on the "Settings" icon.
Here, you will be able to see the list of pre-set issues that are applied globally across all your projects. You can also toggle on or off for new projects for all existing projects that you create, pick the level of importance of each issue - Error, Warning or Notice or or choose to apply this issue to new projects or not.
Configuring pre-set issues at the Project level
On project's Overview or All issues page, you can click on the 3 dots on the right-most side of any issue and turn it off for this project.
Issues that are turned off can be turned back on from going to All issues > Turned off, and again accessing the 3 dot menu on the right-most side of any issue.
Why does the level of importance of the issues matter?
The Health Score metric is affected by the percentage of URLs on a crawled site that contain issues with Error importance, rounded up. Issues of lower importance (Warning, Notice) do not affect the Site Audit health score.
A score of 100 means no URLs contain Error issues. A score of 0 means all URLs contain Error issues.
Note: If you turn off an Error issue for a project that has URLs that contain that error issue, the Site Audit health score will go up. That doesn't mean the project itself no longer has that issue, just that Site Audit is no longer considering that issue in its health score calculation.