On startup, this monitor has a window that pops up with the heading "Monitor Status". It also has "Auayo-switch inputs" "Default input, etc.
How can I delete it?
I do not recognize, "Auayo-switch inputs" ? Did you install the Dell DDM Monitor Application? If yes, while holding down the SHIFT key, right-click on the DDM system tray icon and remove the check from "Onscreen notifications".