How do I shrink the image on an HDMI monitor?

A new windows 10 computer is plugged into an HDMI monitor. The image is about 10% too large at the recommended resolution. The windows bar at the bottom and the icons on the left are off the screen. When I try to adjust the display size from windows, I get choices to make it bigger (125%, 150%) but not smaller. Under advanced there is a (not recommended) choice of adjusting the size but no matter what I enter, the apply button is inactive.