two screens, need help

Guys n girls, I need help.

I was once able to uplink screen shots of charts.

But now that I've got two screens to work off (such profligacy, in this day and age!) whenever I select "Prt Scrn" and paste the copy into Paint, I get both screens' display.

This won't do.

I've managed to figure out how to cut the left screen out of Paint and can work happily on the right screen's chart, but the end result is half a screen to post.

Anyone know how I can isolate one screen or the other, preferably the right side's screen which is the picture I want to post?

Under Screen Resolution, that is the #2 screen.

Here's hoping someone can assist.

Rgds, Dave