The Coding Standard menu allows you to edit your coding standard file, as can be understood by gnatcheck, as well as run it against your code, to verifiy its compliance with this coding standard.
Note that you can also use the contextual menu to check the conformance of a particular project or source file against a Coding Standard.
The Coding standard editor is triggered by the menu Tools->Coding Standard->Edit Rules File. The editor allows you to select an existing coding standard file, or create a new one. The editor adapts itself to the version of gnatcheck you are using on your local machine.
The currently used rules are summarized in the bottom of the editor. Once all rules are defined, you can check the box 'Open rules file after exit' to manually verify the created file.
Once the Coding Standard file is created, you can define it as the default coding standard file for a project by going to the project editor, selecting the 'Switches' tab, and using this file in the 'Gnatcheck' section.