The number of files displayed in 3D View is 24 files (4 files x 6 rows) as the default. You can change it to up to 100 files by changing the number of rows.
1. Click [Configure] at the left bottom in Controller.
2. Click the [Options] tab in the [Configure] dialog box.
3. Move the slide bar at [Rows in 3D View] to set the number of rows displayed.