This method is applicable to Tbox Plus/T-Box Mini/T-Box AI Box/T-Box AR/T-Box LED. (T-Box Lite Box does not support split-screen.)
Video Tutorial: https://studio.youtube.com/video/2jo5tVDSx1U/edit
1. Open the settings page.
2. Click on "APP," open Bluetooth music, and click on the split-screen icon.
3. Click on settings again, and you will see the split-screen interface.