How To Stop Subvocalization – 6 Tips
Occupy your inner voice with a different activity.
Preview any material before reading.
Control your eyes – practice left-right movements.
Train your eyes – learn to catch word chunks.
Distract your other reading organs, e.g. gentle background music.
Use Technology to stop subvocalization while reading.
https://www.speedreadinglounge.com/subvocalization