If you want to specify additional logic for not-found routes, instead of just throwing default 404 page, you may create a special Route for that, at the very end of your Routes file.
Route::group(['middleware' => ['auth'], 'prefix' => 'admin', 'as' => 'admin.'], function () { Route::get('/home', [HomeController::class, 'index']); Route::resource('tasks', Admin\TasksController::class);}); // Some more routes.... Route::fallback(function() { return 'Hm, why did you land here somehow?';});