Overlay bars that are not easily hidden and may contain conflicts with the actual content of the document have been objected to 10 years ago, and the "Signed and all signatures are valid. Please fill out the following form." banner in blue I found today continues to present basically all of the problems from this thread from 2009-2011 regarding purple bars, including that it is not clear how to hide the bar for easier reading or screen presentation. https://acrobatusers.com/forum/forms-acrobat/how-do-you-remove-purple-instruction-bar/

Clicking the blue bar almost anywhere does nothing. There are 2 buttons at the right edge... only one of them seems to work. Clicking the small icon at the left edge hides the bar but does not reveal what feature caused it to exist. By accident, and over an hour after after trying and failing to find a preference to get rid of such an offending bar, I found the signing tools in a left-edge expansion menu even though most of the tools and extra features (tools pane) had been on the right-edge. Nothing in the main menu, such as show/hide, gives any hint that there are tools to find in the left menu or whether the tools there may change. All of these factors seem like failures in the User Interface category.