Capture Window change modified both scenes I had saved

[Jibsman]

I had a scene that captured the center window of a 3 window display of Elite Dangerous. I realize it wasn't capturing a "monitor", but the size of the space viewed in the center monitor. Outside this area were gray stripes.

I had to create a scene displaying the entire display, 7680x1440 so I could report a defect in nVidia's latest driver. This caused an additional error (reported separately).

I am now trying to get my original scene working. However I can't figure where to change the display area.
The first screenshot is what I see. The second is what I want to have displayed, with the stripes outside that area.
Obviously dragging the red window doesn't work.
Thanks
Jibs

 

[koala]

To crop, hold down the ALT key and drag the red window handles.

 

[Jibsman]

Didn't quite work the way I expected. I played around with Shift and CTRL and still don't have it. Recording the wrong3 shows the video too small.
I'm looking for the stripes in wrong4 to come in on the sides from the left and right to where the red box is in wrong3.
But it's a step forward. Maybe I'm still doing something wrong, or using the wrong settings?

 

[Jibsman]

I deleted the game source and started over. This time it changed to a green dotted area. Still no diagonal stripes...

 

[Jibsman]

The way I need it to display on playback is "OBS Correct" and it's displaying OBSVideosmall.

 

[koala]

So you want a video that shows your center monitor only, and you need to cut that center monitor from one big virtual monitor generated by your GPU that includes all 3 monitors.
In this case, go to Settings → Video and set the resolution of the center monitor as canvas. I assume it's 2560x1440. Set the output resolution the same. This defines the aspect ratio and resolution of the product you create - the video.
You will notice the preview has changed. It's now much smaller and has the same shape as one monitor. Remove the capture source and add it again (to reset any edits you might have done). You will see the left monitor in the preview. The center and right monitor are hidden in the overflow area.
Edit the properties of the capture source. I assume its resolution is 7680x1440, so you need to remove the left 2560 pixels and the right 2560 pixels to get the center. So add a "Crop/Pad" filter to the effect filters part of the source and enter 2560 as values for the "Left" and for the "Right" value. Now your source cropped to the center 2560 pixels, and since you set the canvas+output resolution the same, you have no black bars and just the center monitor in your video.

 

[Jibsman]

Apologies for the delayed response. Thank you for your explanation. Much Appreciated!