This is what I see when I am trying to modify the header in this campaign. I cannot see the words I am typing and trying to modify. I must be doing something wrong as you cannot work this way. The edit choices are over the words.
Thank you for reaching out to the Community! In order to see what is under your tool bar, you will want to scroll either up or down so it can move out of your way of typing. You may also want to zoom out on your browser and that may make it easier for the toolbar to move out of your way. I will definitely submit your feedback on this!