If you want to delete your entire watch history, click the Clear all watch history button at the top of the page. 5. Remove just one video from your history. To remove one video at a time from your history, mouse over the video, and look for three gray dots that appear on the far right of the screen.f you want to delete your entire watch history, click the Clear all watch history button at the top of the page. 5. Remove just one video from your history. To remove one video at a time from your history, mouse over the video, and look for three gray dots that appear on the far right of the screen.