Salesforce Password Mode Textbox

The text box input element is now updated with a security feature. That said, form fillers can hide their text behind asterisks. It will help users hide their text while filling into forms.

You start by creating a new blank form. Drag 2 textbox elements, and change their labels as accordingly, say name and phone number.

After selecting the text box, you can see the properties for more information, and set the options as required.

To proceed with details, this tutorial covers the entire process. Also, have a look at this page for more details.