By default, the view being displayed is specified via the view GET parameter.
The name of the GET parameter can be customized via [[viewParam]].
Users specify a view in the format of path/to/view, which translates to the view name
ViewPrefix/path/to/view where ViewPrefix is given by [[viewPrefix]]. The view will then
be rendered by the [[\yii\base\Controller::render()|render()]] method of the currently active controller.
Note that the user-specified view name must start with a word character and can only contain
word characters, forward slashes, dots and dashes.