How to show Laravel Nova(Version 4.0) action in Nova Resource Index?

Im new to nova framework .i need to use action method in Resource Index. According to documentation(https://nova.laravel.com/docs/4.0/actions/defining-actions.html)” ,If an action is enabled for display on the resource’s table row, you may also initiate the action from the resource’s action dropdown menu via the resource index page. These actions are referred to as “Inline Actions”:”
There is a public parameter for $showOnTableRow that you can set on the action.i used it in action nothing happens
And I can’t find any documentation on that. Has anyone figured out how to do it?