Huawei Bar 500 Operation Manual page 50

Switch Screen Content
1
Tap More.
3
Tap to switch screen content.
2
Tap Dual-Screen Mode.
About Switching Screen
Content
To switch screen content is to
exchange the content
displayed on both screens.
For example, if the video is
displayed on screen 1 and
the presentation is displayed
on screen 2, after you switch
screen content, the
presentation is displayed on
screen 1 and the video is
displayed on screen 2.