How to add genre of movies to a collection?

Just started using ErsatzTV.

I am trying to add a genre of movies, not including tv shows, to a collection but there is no select all button on that page: http://localhost:8409/media/movies/page/1?query=genre%3A%22action%22

How do I add all action movies to a collection?

On those pages you can click in the corner of a poster to select one item, then shift click somewhere else to select a range.

With that said, if you want all movies you should use a search query like

type:movie AND genre:action

which will filter out any other media types and can be saved as a smart collection.