Preferences configurable on this page are taken into account when ReSharper produces new code with code completion and code generation features, applies code templates and performs refactorings. They can also be applied to the existing code by using code cleanup with the corresponding settings.
Prefer fully qualified references — select this checkbox if you prefer use fully qualified names rather than namespace import directives for imported types.
Allow the 'imports' alias directive — selecting this checkbox allows using aliases in namespace import directives, as opposed to fully qualified namespace names.