Open the movie list and select a movie:

Click on the movie list button in the control panel or use the shortcut ⌘ 2 to open the movie list.

Scroll the movie list and select the movie you want to play

Double click the movie or press enter to start playing the movie
You can also toggle the query mode of the selected movie by using the shortcut ⌘ T or by clicking on the query button. Movies will be added at the end of the movie query.