In QQ Music, you can follow the steps below to switch the lyrics panel:

1. Open the QQ Music application and play any song.

2. At the bottom of the playback interface, you will see a round button with a note icon on it. Clicking this button will display the lyrics of the current song.

3. If you want to switch to the lyrics panel, you can slide up on the lyrics display interface, or click on the song name at the top of the screen.

4. At this point, you will enter the lyrics panel, and you can browse the lyrics content by sliding the screen up and down.

5. If you want to switch back to the playback interface, you can slide the screen down again or click on the song name at the top of the screen.