If you like to add a comment(note) or clear any comment(note) for all the currently displayed referrals instead of doing so one by one, you can do so following the steps below.
1. Press on the Comment(having Yellow sign) button under Mass Action section or press CTRL+SHIFT+T keys on your keyboard
2. Type the text of the comment(note). If you like to clear all the comments, leave the text area empty
3. Press Update button
After this, all the currently displayed referrals will have the same comment(note) editing applied.
IMPORTANT! This action will be applied on all the currently displayed referrals. To control which referrals to be displayed, you should consider applying filter first.