This text message is part of our page builder and it should be visible only when you open the customizer. The red “Add Widget” link should open the dialog from where you can add the available widgets to the content of your currently opened page and it should disappear when you out from the customizer.
You can freely ignore that message if you don’t want to use our page builder.
Try to Logout from your website in order to see if in that case, the message remains on your pages or not.
Please let me know if the message remains when you log out from your website.