User interface > Translation options > Namespace options > Suppressed namespaces
One of the namespace options is, to suppress special namespaces.
If the button No namespaces is clicked a dialog is shown, where you can enter namespaces, that shall be suppressed.
It is recommended to suppress the namespace for API files. The BOOL type is a striking example of why this should be done
In the picture the namespaces for files of the OSX-API are suppressed. For Windows it is recommended to suppress the namespaces of the files in rtl/Win, i.e. the namespaces, which start with "Winapi".