I have two computers each with two screens. Computer 1 is connected by HDMI, computer 2 by Display Port.

In both cases when I click on the double screen icon above the preview screen it blanks (minimises?) the second screen.

Computer 1 is older, maybe 5 years, Computer 2 is only 1 year old. Both are running Win 10.

The monitors which are matching pairs are different brands for each computer.

I would appreciate any help in this matter.

Thank you,

Peter