Ability to mask certain notes
Quite often I save passwords to websites I visit and add these as Notes to a ToDoist task with a hyperlink to the main site in the main text. It would be really good to have a padlock icon next to such notes that you could click on to mask them out (eg show ******* instead of ToDoist) so you can have the page (and notes) showing but not worry about revealing your password or sensitive data. Clicking the padlock icon again would reveal the sensitive data. The state of the padlock would be saved with each note so next time you came to the note, it would be in the same state as when you last left it.