Glad that you enjoy our player!
In fact, you CAN watch movies, open the main menu and browse video list while lying down.
First, make sure you are playing a video in Void/ Moon/ Space Station scene. Hold on the screen to drag it to the desired position while you're lying down.
Then if you'd like to open the main menu and browse the video list while lying down, please call out the control panel, tap "Video List".
To make the screen follow your head's position and orientation, please simply press Advanced Setting on the control panel > Screen Adjust > Lock Screen, then your screen will track your head position and orientation.
Hope that helps. Feel free to contact us if you have any other questions.