Dragon Medical One has a feature called anchor text mode. This feature is inspired by radiologists that need to dictate into one screen while they click away and manipulate images. By doing this, typically the focus and text will not go where it needs to.
By enabling this setting, you are able to click away from the text box while you are recording. For as long as you are in record mode, the text will continue to go in the proper place. This allows you to look at other applications and look at previous records so long as the text field is not closed.
The lock symbol while you are recording means that the text is anchored into the current text field.