Please refer to my screenshot. This is the adobe sign app in android. As you can see, the document part is quite small. You have to zoom in and out to see. Sometimes it lag that you are not able to zoom in or out. Please have large document that we can just scroll down. As for the upper part, maybe you can use disappear setting when user slide down. The bottom, got page number can move to the right side below the printer button. As for the message, can put down arrow button so we can view more of the message instead of scrolling and a copy button if we want to copy the message.