Press the button "..." in the PDF document viewer.
Then select “Browse / Finger Pointer”.
Select “Record Finger Pointer”.
In settings, you can define a small offset between your finger and the red dot, so you can also see the dot while recording.
Recording the position syllable by syllable can be challenging for fast songs. Often, it is sufficient to display just the current line with the dot.
Confirm and start recording with this button.
Point with your finger where you want a red dot to appear during playback.
Press the “Stop” button to end the recording.