Passing values from one controller to another

Been at this for ages, can't find a solution. I've searched and none of the posts help, possibly me not getting it as I'm new to Laravel (5.4)

I want to be able to be able to access "$site_settings" from one controller to another. Also "$site_settings" need to be accessible on all controllers and views. I also need to get variable from URL (hence Request in __construct( Request $request ) ) but it doesn't work either.

Would really appreciate any assistance.

Thanks.

See code below:

//BaseController
class BaseController extends Controller {

    public function __construct( Request $request ) 
    {
        $slug = $request->slug;

        $site_settings = \DB::table('sites_settings')->where('slug', $slug)->first();

        View::share( 'site_settings', ['slug' => $slug, 'color' => $color] );

    }   
}

class SettingsController extends BaseController
{
    // SettingsController
    public function index( )
    {               

        //how do I access $site_settings here and pass it on to the view?

        // return view('settings.index');
    }
}

via Chebli Mohamed