New
#1
What is the make and model# of your Monitor?
The Display Menu Button Bing is talking about is a button on the front of your Monitor not on your desktop. Set the Monitor to Default Settings.
As for changing the Resolution or the Background picture, Right click a blank section of your desktop and choose Display Settings. To reset the resolution. For background picture and color, right desktop and choose Personalize/Background
Or go to Settings/Personalization/Background