You should dismiss a code scanning alert if the flagged code is not a true security concern, such as:
*-> Code in test files
Code paths that are unreachable or safe by design
False positives from the scanner
Fixing the code would automatically resolve the alert - not dismiss it. Dismissing is for valid exceptions or noise reduction.

The filter that applies here is secret-scanning-push_protection.bypassed:true.
When navigating the Overview dashboard of the organization-level or enterprise-level security overview, filters must include the name of the feature to scope down the global metrics.
secret-scanning-push_protection.bypassed:true: This is the correct macro filter required by the global Overview dashboard to target secrets that bypassed push protection across all scoped repositories.
Incorrect:
bypassed:true: While this variant works when you are already viewing individual repository alert pages or the dedicated Secret Scanning alert view specifically, it is not the standard multi-feature filter key on the primary Overview page.
[Not C, Not D]
push_protection.bypassed:true and bypassed.secret-scanning:true: These syntax variations do not conform to GitHub's formal search qualifier layout for the main Security Overview dashboard.
Reference:
https://docs.github.com/es/[email protected]/code-security/reference/security-at-scale/overview-dashboard-filters

GitHub secret scanning detects and alerts on sensitive data exposure, such as API keys and credentials, in your code repositories.

If your workflow uses the language matrix, then CodeQL will only analyze the languages in the matrix.
Note:
The default CodeQL analysis workflow file created after configuring advanced setup for code scanning with CodeQL defines a matrix containing a property named language which lists the languages in your repository that will be analyzed. This matrix has been automatically pre- populated with supported languages detected in your repository. Using the language matrix allows CodeQL to run each language analysis in parallel and to customize analysis for each language. In an individual analysis, the name of the language from the matrix is provided to the init action as the argument for the languages input. We recommend that all workflows adopt this configuration.
Incorrect:
[Not A]
Using the language matrix allows CodeQL to run each language analysis in parallel.