What is Read-Only mode?
Read Only mode is a temporary, user-controlled setting that allows the user to move around in a survey without inadvertently changing anything via the auto-save feature.
The Read Only button is located at the top of the left navigation tree in any given plan. If it is red, you are in read only mode. Click the button to toggle into edit mode. Click it again to go back to read only mode. It is a good rule of thumb to leave the button toggled to Read Only until you are ready to make edits to a given page.