Whether the screen can be projected into horizontal screen on TV depends on whether the screen is projected into horizontal screen or vertical screen. Most works on Tik Tok cannot be projected into horizontal screen, so the screen projected into TV cannot be projected into horizontal screen either. If the Tik Tok videos support horizontal screen, you only need to turn the phone into horizontal screen to make the screen on TV into horizontal screen. As follows:

1. Open Tik Tok and click the icon to switch to full screen.

2. Turn the phone into horizontal screen, and then the screen projected into TV will also become horizontal screen.