Marantz SR6006 - Marantz title banner is stuck


My spouse turned on the TV tonight and somehow got a black rectangle (with the word Marantz in it) that blocks the upper left corner of the TV screen. I have played with the remote but I have discovered no way to remove it. I paged through the manual but I don't even know how to describe the problem in a way to look up its solution. Any ideas?
shlingr